+1 Upgrade Per Kill Wiki
Codes
Official and reported codes, with the source and date for each one.
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Quick answers
Frequently asked questions
Is there a code for free classes?+
No such code is published by the developer. Classes other than Warrior are sold as Robux passes; see the classes page for prices.
Why does a code say it is invalid?+
Check spelling and capitals first (WELCOME is all capitals). Codes usually work once per account, so a code you already used will not pay out again. Codes can also be retired without notice.