Doors

Doors are contraptions made of metal, and can only be opened if you hit the blue button (or both if there are two. The door will not open unless both are hit).

On the Introductory stage, there are blue arrows pointing to the switch.

2 door buttons stages are start checkpoint stage 3, checkpoint 3 stage 2, checkpoint 5 stage 1, checkpoint 8stage 1, 2 and 3, checkpoint 9 stage 1 and 2, checkpoint 10 stage 1 and 3 and endless mode.

Automatic doors are checkpoint 10 stage 2, checkpoint 11 stage 4, mayhem boss and local multiplayer modes.

1 door buttons stages are start checkpoint stage 1, 2 and mayhem boss, checkpoint 1 stage 1, 2,3 and mayhem boss checkpoint 2 stage 1, 2, 3, 4 and mayhem boss checkpoint 3 stage 1, 3, 4 and mayhem boss checkpoint 4 stage 2, 3 and mayhem boss, checkpoint 5 stage 2, 3, 4 and mayhem boss, checkpoint 6 stage 1, 2, 3 and mayhem boss,checkpoint 7 stage 1, 2, 3 and mayhem boss, checkpoint 9 stage 3 and mayhem boss, checkpoint 11 stage 1, 2, 3, 4 mahyem mode and mayhem boss and endless mode

The buttons are reused in the Local Multiplayer Modes for one glass pane