There are certain requirements of how many mice there needs to be in a room in order for certain things such as stats and experience points to take effect.
Notes
- Using multiple accounts using the same IP address won't count to the total amount of mice when regarding these limits.
- Any changes to the mice amount doesn't take effect until the next round. For example, if there are 49 mice in the room, and during the round an extra mouse joins resulting in there being 50 mice, the mice's clothing doesn't get hidden until the next round, i.e. if there still are 50 mice in the room next round.
- These are the total amount of mice. 11 mice means 11 mice including you.
List
| Effect | Mice (at least) needed to take effect | Notes |
|---|---|---|
| Run Lua script in tribe house | 1 |
|
| Pick up snowballs during Christmas events | 1 | Only works in official rooms (e.g. vanilla[number] - the room name at the top right appears in yellow instead of blue). |
| Get cheese or experience points (from entering the hole) | 2 | |
| Get saves or experience points by saving mice | 3 (normal rooms) 5 (custom rooms) |
 Shaman coins require 4 (divine mode), 5 (hard mode) or 6 (normal mode) saves. Experience points limited to 25 saved mice per round. |
| Bootcamp stat increases | 4 when the round started | Stats count if there were 4 mice at the start but some left. Stats do not count if there were less than 4 mice when the round started. Also, if you joined the room after the timer has passed 5:30, the bootcamp stat does not increase the first time you enter the hole. This is to prevent "room-hopping". (Read more here.)  Bootcamp coins have a 4 minute cooldown to earn another bootcamp coin.
|
| Adventure maps appear | 4 | |
| Presents or Vegetable Garden collectibles appear in maps | 4 | |
| Transformation maps occur | 5–16 | |
| St. Patrick's Day collectibles appear in maps | 6 | |
| Racing, survivor or defilante stat increases | 6 |  1 racing coin for every 5 rounds completed.  Survivor coins are given to the shaman if the round lasted at least 30 seconds and the room is not protected by a password. They require at least 4 mice killed that round (excluding /mort and AFK mice).  1 defilante coin for every 3 rounds completed.
|
| "Cheese gathered first" stat increases | 10 | 10 for maps without a shaman. 11 for maps with a shaman. |
| Get cheese gathered as shaman | 11 | |
| Outfits get hidden | 50 | To reduce lag in overpopulated rooms |
| Consumables disabled | 50 |