The shareware version includes the entire first episode of the game, Turtle Terror.
NOTE: This game can be played directly in Windows using a third-party engine recreation (see the links section below).
At any time during gameplay, hold both P and [Backspace] and type one of the following codes to cheat:
ddapogee: 16 color mode
ddbad: Toggle escort bird
ddbouf: God mode
ddcheck: System information
ddcstrike: Toggle airboard
dddoom: Tougher enemies
ddgunhed: All weapons, full ammunition
ddhooker: Bonus level
ddken: Quit to DOS
ddlamer: Skip to the next level
ddmark: Kills Jazz
ddsable: Toggle high speed and jumping
Skip to ending: At the level selection screen, press the following three keys at the same time: F10-F11-F12.
Description by VGTips