Mutations

''Mutations are extra abilities that are given to you at the end of a level if you have leveled up. To level up you need to get 60 Rads multiplied by your current level number, which means the amount of Rads required increases with the character's level (60, 120, 180, etc.). Each level up is signified by a white crown symbol, appearing above your character. Going over level 9 and essentially reaching level 10 (Level Ultra) allows you to choose one of the character-specific Ultra Mutations listed below the regular Mutations table.''

Mutations table
''A list of all the mutations in alphabetical order. At the end of a level you can choose between 4 randomly rolled mutations per level up. Currently the game allows players to reach level 10, which means a total of 9 mutations. (Or 10 mutations if you take the Crown of Destiny, 11 if you also picked Patience)''

In Co-op picked mutations will affect both characters.

Ultra Mutations table
''Going over level 9 and essentially reaching level 10 (Level Ultra) allows you to choose one of the character-specific Ultra Mutations. On the experience bar the number 10 is replaced by a crown icon, indicating that your character reached its full potential. This adds 1 extra mutation to the max that your character can have. That's a total of 9 mutations, 10 with Crown of Destiny, 11 if you also picked Patience and 14 if you play as Melting with his second Ultra Mutation.''

 

Co-op Ultra Mutations table
''Going over level 9 when playing in Co-op and essentially reaching level 10 (Level Ultra) allows you to choose an Ultra Mutation unique to Co-op which will affect both characters. You will pick it instead of the character-specific Ultra Mutations listed above, which are unavailable in Co-op.''