Dead Pixels Big Head mode
Successfully complete the original Dead Pixels campaign on the Hard difficulty to unlock Big Head mode.
Black And White mode
Successfully complete at least 10 waves in Last Stand Survival mode to unlock Black And White mode.
Colorful Blood mode
Successfully complete the original Dead Pixels campaign on the Normal difficulty to unlock Colorful Blood mode.
Hyper Combat mode
Successfully complete at least 10 waves in Last Stand Survival mode to unlock Hyper Combat mode. Note: Enabling this mode prevents achievements from being earned.
Running Zombies mode
Successfully complete The Solution campaign to unlock Running Zombies. Note: Enabling this mode prevents achievements from being earned.