Frog King 99 Nights in the Forest is the headline encounter of the Frog Invasion update, locked behind a special cave and a clear checklist. This guide explains how to reach Frog Cave, where to collect all eight Frog Keys, how the fight works at a high level, and what loot you can earn with confirmed drop rates.
What is the Frog King encounter?
The Frog King is a new boss introduced with the Frog Invasion update. You will not stumble into this fight by accident. It sits behind a locked door inside Frog Cave and requires preparation before you can even step into the arena.
Once you clear the key-related gate, you enter a dedicated boss room to take on the Frog King. The encounter is tuned to be challenging, so coming in with the right class and a plan pays off.
How to unlock Frog Cave
Finding the cave is the first hurdle. Look for the giant whirlpool on the map and jump into it. That plunge is your doorway into the Frog Cave area.
The door to the boss is sealed by eight locks. To open it, you need 8 Frog Keys, each found at a different pond around the world. Because there is one key per pond, the route is straightforward but requires full-map coverage.
Step-by-step:
Scout the giant whirlpool and jump in to access Frog Cave
Fan out across the map and visit ponds to collect all 8 Frog Keys
Return to the cave door and place the keys to unlock the arena
There is no shortcut that bypasses the eight-key requirement. Plan a clean loop so you are not backtracking, and consider marking ponds you have already cleared to avoid overlap.
99 Nights in the Forest Frog Keys locations
Keys are tied to ponds rather than to one fixed corner of the map. The practical approach is to canvas pond locations systematically. If you are playing with friends, split the map into sectors and call out completed ponds so the team covers ground efficiently.
Because every pond holds a single key, you will know you are done when you have eight. When in doubt, retrace your route and confirm any ponds you may have skirted around during combat or gathering detours.
How to defeat the Frog King
The fight is demanding and rewards clear positioning and sustained damage. A recommended choice is the Alien class with a ray gun, which lets you pressure the boss from range while you keep the arena under control.
Keep your plan simple and repeatable:
Maintain distance so you can read the boss and avoid avoidable damage
Use cover and reposition when the arena gets cramped
Commit to windows where you can land uninterrupted shots from your ray gun
Group play helps. Have teammates draw attention and create space so your ranged damage can tick without interruption. If things get messy, reset your spacing and re-engage rather than trading hits in tight quarters.
Frog King rewards and drop rates
After a win, you can open a reward chest with exclusive Frog Invasion loot. The drop rates are low, so expect to farm multiple clears if you are chasing specific pieces.
Poison Spear — 3%
Poison Armor — 1%
Blowdart — 1%
Frog Boots — 1%
Among these, Poison Armor and Frog Boots are the most sought after due to their rarity. Because the items are tied to the Frog Invasion update, target your farming while the content is active to avoid missing the window.
Efficient farming checklist
Unlock the cave once and keep the route fresh in your head for repeat runs
Use Alien class with a ray gun to simplify the fight pattern
Stay mobile and favor clean, ranged uptime over risky face-tanking
Run with friends to control the arena and shorten attempts between clears
Small optimizations add up when drop rates are low. Treat each entry as a measured repetition rather than a scramble, and your completion pace will stabilize.
Final Thoughts
Frog King 99 Nights in the Forest boils down to three clean beats: find the whirlpool to access Frog Cave, gather 8 Frog Keys from ponds to open the door, and defeat the boss with a stable ranged plan like Alien plus ray gun. Clear runs translate into more chest openings and better odds at rare drops, making a disciplined loop the best path through the Frog Invasion update.