Keys in 99 Nights in the Forest: Every Key Type, Every Lock, and Which Door Is Worth the Trip

Six keys and six locks, made four completely different ways — fished out of a pond, dropped by whichever guard dies last, pried out of a temple that collapses behind you, or supplied by a corpse. What each key actually costs you, what sits behind each door, and why the eight-key farm everyone recommends is not the best one on the map.

Updated 2026-10-05

There are six keys in 99 Nights in the Forest and four different machines making them. A Frog Key is something you reel out of a pond with a rod. A Red Key is the last thing that happens to five wolves. A Crystal Skull Key is a stone you knock out of a temple that immediately falls down behind you. And on the Alien Mothership there is no key at all — the doors take a body.

Almost every guide on the game treats these as separate side-quests, which is fair while you are playing one of them, but it means nobody has ever put the whole locking system on one page and asked what it is actually worth to open.

This page does that.

Last verified: 2026-10-05.

Quick Answer

Three of the six keys are made the same way: kill a pack, and whoever dies last drops the key. Red, Blue, Yellow and Grey all work that way. Clearing four out of five wolves gets you nothing. One survivor and the cave stays shut.
The Frog Key is the only key you can obtain without killing anybody. You fish it out of ponds marked with a glowing green key. You need 8, one from each key-marked pond, and they go into eight keyholes on a door underneath a whirlpool.
The Skull Key is the only key that costs you the building. Each of the four Jungle Temples hands out one Crystal Skull Key and then collapses. Four keys, four altars, one hidden room.
The campfire is the real gate, not the key. Every lock on this page sits behind a campfire level. You can carry eight Frog Keys around for a whole run and still be locked out. The key is a scheduling problem wearing a loot costume.
If you want the Poison Armour, do the Jungle loop, not the Frog Cave. Four locks gets you there at a high drop rate. Eight locks gets you to the Frog Chest, which rolls the Poison Armour at around 1%.

Every Key in the Game, on One Table

Key	Colour	How it is made	How many you need	Where it goes	Campfire gate
Frog Key	Green	Fish it from a key-marked pond, or rarely a frog kill	8	Eight keyholes on the green door inside the Frog Cave	2 — single source
Red Key	Red	The last of five wolves dies	1	Dino Kid's cave	2–3
Blue Key	Blue	The last of four Alpha Wolves dies	1	Kraken Kid's cave	3–5
Yellow Key	Yellow	The last of two bears dies	1	Squid Kid's cave	4–5
Grey Key	Grey, sometimes called Black	The last of six bears dies	1	Koala Kid's cave	6
Crystal Skull Key	n/a — a stone	One per Jungle Temple basement	4	Four altars on the Mother Temple	Jungle edge from 2+

Read the "how many you need" column twice, because it is the whole page: eight, one, one, one, one, four. The four kids' keys are individually cheap and the Frog Key is expensive, but the Frog Cave is a single door and the four kids are four separate doors — that difference is where the cheapness hides.

The Four Coloured Keys: a Rule With No Margin

The missing-children caves are the oldest locking system in the game and the least tolerant. The gate is an iron grate door with a padlock; the key comes off the last guard.

Dino Kid — Red Key, Campfire 2–3. Five wolves with red collars on a fenced hill. The easiest one and the correct first target.
Kraken Kid — Blue Key, Campfire 3–5. Four Alpha Wolves, which is where the Bear Trap habit starts paying off, since Alpha Wolves can be trapped and kited rather than traded blows with.
Squid Kid — Yellow Key, Campfire 4–5. Only two Bears, but Bears are tanky and the site's rescue page recommends traps over standing shots.
Koala Kid — Grey Key, Campfire 6. Six Bears. This is the hardest encounter in the main quest and the page's advice is to clear it across several days rather than push on at dusk.

The mechanic that catches people: there is no partial progress. Kill four of the five wolves and walk away, and the cave is exactly as locked as if you had killed none. The key is bound to the fifth kill, not to the cave. That means every clear is all-or-nothing, and a run that goes out to the Dino cave at night with four health left does not get a "try again tomorrow" — it gets nothing at all.

Cost accounting is blunt. A single run that collects all four coloured keys kills 5 + 4 + 2 + 6 = 17 guardian creatures, and by the time you reach the Grey key you have spent the whole middle of the game on locksmithing rather than survival. That is the price of the four kids, and it is not visible from the Missing Kids page, which reports the rewards (+1 day multiplier each) without ever counting the kills.

The Frog Key: the Only Key You Fish

The Frog Cave is the dungeon everyone has heard of, and it is gated twice — a campfire level and eight Frog Keys.

The farming route is the unusual part. Each key sits in its own pond, visible as a glowing key marker floating in the water, and you catch it with a fishing rod. One key per pond. That makes it the only lock in the game you can work while the forest is doing something else to you, and it is why our Frog King page calls it a reliable route rather than a gamble.

The second route is combat: killing frogs. Sources disagree sharply on how well this works, and we cover that in Where Sources Disagree. Treat fishing as the plan and frog kills as the top-up.

Getting in is two steps most guides merge into one. The pond with the whirlpool has a no-diving sign next to it, jump into the whirlpool, and it takes you underground. Inside is a giant green door with eight keyholes. Eight keys or seven, and the mechanism does not acknowledge you at all — which is the most expensive way to discover you are one pond short.

What is behind the door is the Frog King, a boss that does not stay dead quietly and cascades into smaller frogs when you drop him. Behind him is the Frog Chest, and this is where the economics turn.

The Eight-Key Door and What It Actually Pays

The Frog Chest's rates are 3% and 1% depending on which item you are rolling for. That number appears on our own Frog Cave page and it is the reason the page calls this dungeon the most mis-valued place in the game: eight keys of fishing, a whirlpool dive, a boss gauntlet that spawns fourteen frogs on the way down, and then a chest that gives you nothing most of the time.

The thing the chest does not pay is what makes the run worth it. Beating the Frog King is a badge, and the badge table is where the diamonds actually sit — not in the loot pool.

But hold that thought, because there is a cheaper door with the same loot table on it.

Why the Jungle Loop Is the Better First Farm

Here is the comparison nobody has put in writing.

Route	Locks you must fill	Mandatory kills	What comes out
Frog Cave	8 Frog Keys	0 if you fish	Frog Chest at 3% / 1%; Beastmaster badge
Jungle skull loop	4 Skull Keys	0 (the roof cultists are optional)	Overlord Jungle Chest: Poison Claws, Poison Armour, Blowpipe — high drop rate
Four kids	4 coloured keys	17	4 × +1 day multiplier, Orienteering badge

Three findings fall out of that table.

The Frog Cave costs twice the locks of the Jungle loop. Eight keys versus four. If time is the currency — and on a survival run it always is, because night is a deadline — the Jungle gets you to the same reward class with half the grinding.

The Jungle loop pays a guaranteed number of diamonds. The wiki's badge table lists Archaeology at 6 diamonds for placing four skulls on four podiums. That figure is published, it is specific, and it does not depend on a percentage. The Frog route's headline reward is a percentage roll.

The Poison Armour has two doors now, and only one of them is the Frog Cave. Our armour page already notes that the Jungle Biome added a faster route: clear the four temples, take the four Crystal Skull Keys, and the Overlord Jungle Chest drops the Poison Armour at a high rate. The Frog Chest rolls it at around 1%. If Poison Armour was your reason for farming eight keys, that reason is now half price.

The honest caveat, and it is a real one: the Poison Spear looks like it is still Frog-only. Every source we found points at the Frog King for the Poison Spear, and none of them offer a Jungle alternative. So the two routes are not fully interchangeable — if a Poison Spear is the item you want, the eight keys are unavoidable. If it is the Armour, or the diamonds, or simply the progress, go to the Jungle first.

One practical rule for the skull loop, straight from the fandom wiki and worth repeating here because it is the whole difference between a clean run and a bruising one: stand by the rope before you take the stone. The temple's exit is a rope at the back, not a door, and the Blowdart blast that comes with the key arrives whether you were ready for it or not.

The Only Key That Destroys Its Own Door

Every other key in this game is reusable in the sense that you carry it somewhere and it opens something. The Skull Key inverts that: taking it is the event that ends the temple.

Clear the basement obby, get past the traps to the Skull Trial Stone — one per temple, guaranteed — and the structure begins to come apart. You then leave the way you came in, by rope. The Jungle Biome page covers the collapse timing; the part relevant here is that the loop is deliberately self-cancelling, which is why it caps at four and why four is exactly the number of altars on the Mother Temple.

Naming, because it will cost you a search otherwise: the jungle-temples guide calls it a Crystal Skull Key, the community calls it a Skull Trial Stone, and the wiki uses the second name throughout. Our own All Locations page lists the drop under one name and the temple route under the other. Same stone.

When a Key Does Nothing

Two known failures, both specific enough to save a run.

The sack drop. If you store a coloured key in your sack and drop the sack near the gate, the key can fall on the far side of the cave's gap and the padlock will not accept it. The wiki's workaround is to drop items through the gap to shove the key forward into position, or to place yourself inside the cave and ignore the lock entirely for the rest of the trip and collect on the way out.

The lucky drop. At the opposite end of the same bug, if the last guard dies standing right next to the lock, the key can spawn on the lock, the door opens immediately, and the key is consumed. Both behaviours are documented as intermittent, which is presumably why they are still in the game rather than being fixed.

Neither is a bug you can plan around. Both are worth knowing when a door refuses a key you are certain you have, because the answer is not "fewer or more keys".

Body Keys: the Mothership Takes Corpses

The Alien Mothership is the one lock in the game that refuses keys outright. The hatches carry alien face scanners, and they read corpses.

Kill an Alien Commander or Alien Scout, carry the body to the matching scanner, and the hatch opens. Every locked section costs one fresh corpse, and corpses do not stack, so you ferry them one at a time. Three side rooms means three kill-carry-scan cycles in a single raid, which is the reason a rushed solo mothership run is really three round trips rather than one dungeon.

It is worth reading that mechanic as a statement about the rest of the game: 99 Nights uses keys as a produced thing — farmed, fished, killed for, carried. The Mothership is the exception that proves the rule, because aliens have no inventory to lock.

The Campfire Is the Door You Cannot Pick

Look back at the first table. Every single row has a campfire level in the last column, and the Grey Key row is Level 6.

That means the locking system is not a loot problem. It is a calendar problem. You can fish eight Frog Keys on day three and the cave will not open until the fire says so. You can kill five wolves at campfire 1 and the Dino cave is not on the table. The four kids' caves are laid out at 2–3, 4, 5 and 6 deliberately: they read as a ladder, and every one of them is really a statement about how much wood you have burned.

The practical consequence is that key farming should be scheduled backwards from the campfire level, not forwards from the day you feel ready. Fish the frog keys while the fire climbs toward its next level, because fishing costs you almost nothing in the meantime; hold the coloured-key clears for the day the fire hits their number, because those cost you kills you would rather spend on food and ammo.

And if you are running for the 9x day multiplier, the speedrun guide is the page that translates all of this into an order — because the last +1 on that ladder is locked behind the same fire levels, and the two goals are competing for the same wood as the campfire climbs.

Where Sources Disagree or Are Silent

Read this before you build a run plan.

How many Frog Keys exist on a map. Most guides — including ours — describe a fixed pattern: one key per pond, canvass the map, get eight. Jugo Mobile states the opposite outright: "There isn't a set amount of Frog Keys on a map," and says you can farm frogs and fishing spots until you have what you need. These cannot both be true. The fishing route works either way; the number of ponds you must visit does not.
Which frogs drop keys. Our frog page already records two versions: one says a Green Frog drops the Morsel while the other types carry the key chance, another says all types have a chance. Jugo Mobile splits the drop further, saying purple frogs drop keys "relatively frequently" and blue frogs "more rarely". None of these are measured rates, and the pond route is reliable under all of them.
The colour of the fourth key. Grey, or black. Current wiki tables, Pocket Tactics and BloxGuides all say Grey. An older wiki revision (July 2025) lists it as Black/white, and our own Missing Kids page hedges with "Grey, sometimes called Black". One key, two names, a decade of confusion.
The campfire levels on the four caves. Three different sets are in circulation: the current wiki says 2–3 / 3–5 / 4–5 / 6; our rescue page says 2–3 / 4 / 5 / 6; an older wiki revision from July 2025 says 1 / 2 / 3–4 / 4–5. Take the current wiki's numbers and verify against the poster board before you commit a day.
Whether the Frog Cave needs Campfire Level 2 at all. This comes from a single location listing in our own data; none of the guide-level write-ups mention it. We take it seriously and we flag it as one source.
Frog King or Frog Prince. The same boss is called both, most visibly in older guides. It is a naming drift, not a second enemy.
How many pyramids the Jungle has. The badge table notes the wiki saying five pyramids, four skull keys and four skulls, against the four-temple figure our Jungle page documents. Four temples is the better-supported number.
The Archaeology reward. The 6-diamond figure comes from the wiki's badge table. One guide scores the same badge at half a star and never states a diamond count. The requirement is agreed; the pay is not.

FAQ

Do the coloured keys work on any cave? No. Each key is a single-use answer for one padlock. Holding a Red Key does nothing at the Kraken cave.

What happens if I walk away with one guardian still alive? Nothing. The key is dropped by the last guard, so a partial clear is worth exactly zero. Finish the pack or leave and come back with a full clear in mind.

Is the Frog Cave the best dungeon in the game? For the Poison Spear, yes — it is the only route we found. For Poison Armour and for diamonds, the four-lock Jungle loop pays better and rolls far more often.

Can I get Frog Keys without a fishing rod? Killing frogs can drop them, but the drop rates are described inconsistently across sources. The rod is the reliable answer and it is available from day one in the Tool Workshop.

Is the key consumed when a door opens? For the four coloured keys and the skull keys, yes — they are placed into a lock. Frog Keys go into eight individual keyholes and are likewise spent.

Why does my key not open the cave when I have it? Check the campfire level first, then the sack-drop bug. If your fire is below the gate, no amount of keys will move the door.

Are there locked doors that do not use keys? Yes — the Alien Mothership hatches take corpses on face scanners, and the Jungle Temples run their own collapse-and-rope exit rather than a lock.

Sources

Missing Kids Locations — the four coloured-key caves and their campfire gates
Frog Cave — the whirlpool, the eight keyholes and the two gates
The Frog King — the boss behind the eight keys
Jungle Biome — the four temples and the skull key loop
Fishing Guide — the rod, the ponds and the key catches
How to Get the Poison Spear — the Frog Chest route
How to Get the Poison Armour — the Jungle shortcut, and the 1% roll
Bear Trap — the fastest way to clear the two-bear and six-bear caves
The Bear — who exactly you are killing for the Yellow and Grey Keys
The Alpha Wolf — the Blue Key's guard pack
The Wolf — the Red Key's five, and the cheapest clear in the game
All Badges — the 6 diamonds the Archaeology badge pays
Campfire — the level every lock on this page is gated behind
How to Get Wood Fast — the level-6 wall behind the Grey Key
Ammo Guide — what the kills you spend on keys would have bought instead
Speedrun Guide — where these locks sit on the 9x day ladder
Alien Mothership — the corpse-scanner doors
Cultist Gem — the currency the temple runs pay into
Crafting Bench — the fire levels and the bench tiers that gate everything
Chest Tiers — why the Frog Chest's 3% and 1% are low in relative terms
All Locations — where each locked place sits on the map
Hard Mode — the mode where a wasted key run is a wasted run

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