Cheat Mode
     Press [Esc] during gameplay, type chicken, then press [Esc] again
to  enable  cheat  mode  and invincibility. Note: You may still lose a
life  by  hitting  a wall. Press one of the following keys to activate
the corresponding cheat function.

Mission Skip: press Q
Double Speed: press T
Disable Cheat Mode: [F12]

level codes
1 - 2MMSXMMMP
2 - 9BN8QMMMZ
3 - 9BB63MMMF
4 - YVV6KNMMQ
5 - YVCGSBMMR
6 - MCXJXVMM4
7 - MCZQLCMMJ