Rocket Rats - Theorycrafting Notes

Up to date as of 2025-07-02.

Upgrade Potential

All rats get:

You always get the initial upgrade, depending on the rat.
You always get 30 more upgrades by endgame (one upgrade at the end of each wave).

Builds:

Most rats:
- You only get the 31 upgrades.
Mr. Lucky: Start, Up, Up, Right, Up, Left
- You get 6 more upgrades, for a total of 37 upgrades

Relevant Upgrades list

	I	II	III	IV	V	VI	VII
Impact	+20% Projectile Damage	+30% Projectile Damage	+30% Projectile Damage +50% Knockback	+80% Projectile Penetration	+20% Projectile Damage +60% Projectile Penetration	+2 Shot Number Switches shot spread to angular	+4 Shot Number +80% Projectile Damage +50% Knockback +50% Ammo
Rush	+20% Fire Rate	+45% Reload Speed	+40% Fire Rate +25% Reload Speed	+10% Fire Rate +60% Reload Speed	+30% Fire Rate +50% Reload Speed	After reloading, you have 30% chance of increasing your fire rate by 200% until your next reload
Critical	+10% Crit Chance	+10% Crit Chance +15% Fire Rate	+15% Crit Chance +15% Crit Damage	+15% Crit Chance +25% Crit Damage	Whenever a shot kills an enemy with a critical hit, it increases your next attack’s shot number by 1	+20% Critical Chance Surplus critical chance turns into critical damage	Hitting a critical shot empowers your next attack with 60% increased critical damage
Ammo	+30% Ammo	+50% Ammo	+20% Ammo +20% Projectile Damage +20% Fire Rate	+100% Ammo	+50% Ammo Increases projectile damage by 200% of your ammo	+1 Shot Number	Every attack consumes only 1 ammo
Movement

Cheese X
- +50% Cheese
Perforation X
- +100% Projectile Penetration
Overload X
- All sources have +100% damage
Gear II
Gear III
Gear IV
- +1 Shot Number
Gear V
- +1 Shot Number
- +2 “Weapon Base Damage”
- +4 “Weapon Base Ammo”
Glass Heart ???
- Set to 1 heart only
- Multiply all bonus projectile damage by 2
Unalterable Critical ???
Speed Transmutation ???
Silver Bullet ???
Cursed Cannons ???
- 0.5x Reload Speed
- 3x Shot Number