Here are the codes:
These codes should work immediately.
At the time of writing 5/27/22 these are all the codes available. If they don't work ask the discord!
Orchid - unlocks more plant variants for Parks
Dance all night - allows you to change the color of the Nightclub's lights. There are 5 options: Colorful (default), Fast and Red, Slow and Blue, Rainbow Light, Romantic and Pink.
Stats - gives cool info about your city (Works on all games)
coolmath - gives cool info about your city (Works on all games, not just CoolMath)
debug_pathfinder - debug secret code (Works in regular game but not on coolmath games)
hangar - allows you to change the sprites of the ships (Works in regular game but not on coolmath games)
Note: Some may not work on other websites and uppercase doesn’t matter.