Redeem carefully
The experience description currently lists MONKEYS for 1,000 gems. Enter it only through the game's own code interface. A listed code is not a promise that it remains active.
Practical check
If the code fails, check spelling, expiry, and whether the game has an official updated code list. Never share your Roblox password to claim a reward.
Source
Roblox — Survive a Million Monkeys
Independent fan-made guide. Not affiliated with Roblox or the game creator. Game details and codes can change; verify current information on the official experience page.