Fun

Here are some fun things you can try out:

Thinicetrobarrier: Play Astro Barrier with a black puffle...Huh?

Mission 11: Play the last (and probably hardest) PSA mission, "The Veggie Villain".

System Defender: Now you don't have to be an Agent!

Parachute into nothing: Look at a background where you're falling in a parachute!...except you're not there.

Mission 8: Probably  the 2nd hardest PSA mission: "Mysterious Tremors"!

Weird Telescope: Move your mouse, change the view.