Explosive Shell (Green):
- Instakill
- Generally there is only one per sequence
- Handsaw makes it deal 4 damage instead
Slug Shell (Yellow):
- 2 damage per shot
- Handsaw makes it deal 1 damage instead
Incendiary Shell (Orange):
- No initial damage, sets the target on fire instead
- Burning players take 1 damage every sequence until extinguishing (surviving 4 sequences)
- Very rare, with there being only one per sequence usually
Gas Shell (Purple)
- No damage
- Skips target's turn (and yours too)
- Applies blur effect to target's screen
All of these are not in-game by default and have to be enabled manually