If you want to fix this in your current project you add "If (phase = 2) then (switch costume to (phase 2 costume) else (switch to phase 1 costume)" the name of the costume has to match phase 1 ex: 0 and (0 with a space after it) and, 1 and (1 with a space after it) Do this to all mentions of switch sostume blocks in the polos and characters.