Cheats

ZZT has a number of hidden cheat codes accessible by holding SHIFT and press ? to bring up a text-box in the upper-right corner.

Give all keys keys

Clears the flag 'flagname' -flagname

Sets the flag 'flagname' +flagname

Darken level +DARK

Un-darken level -DARK

Debug mode off -debug

Debug mode on +debug

Give 3 torches TORCHES

Give 5 ammo AMMO

Give 5 gems GEMS

Give 50 health HEALTH

Removes anything within 1 square ZAP

Be warned that setting/clearing flags and ZAP-ing may break a game world and render that savegame useless.

The ZAP command is particularly dangerous as it permanently removes anything within 1 square in each of the cardinal directions and replace it with an empty space. You can easily ZAP an object containing vital code that was disguised as scenery or a part of a wall.

A handful of ZZT games with custom 'engines' have the player deliberately set flags to do things like access inventories or activate context-specific commands.