To do Mr. Freeze's Glide press A and while in the air, hold A. While doing this, you may steer around with the control panel.
Enter LEVELLOCKSMITH as a code.
In case you don't want to remember those pesky code words and play randomly through levels.
Enter FROZMASTER as a code.
It maxes everything out from health, super moves, and everything else.
Enter MRIMASTER as a code.
This is to max everything possible including health, super moves, and everything else.
Enter WHYMUSTWEFIGHT as a code.
It provides unlimited energy throughout the game.