Flash games we all played as kids

Inspired by a discussion on the Discord.

Feel free to add to the list if you think I missed any.
 * All of the Grow games
 * Learn to Fly and Learn 2 Fly
 * All of the Duck Life games
 * JMTB02 games in general
 * Super Mario 63
 * Ultimate Flash Sonic
 * Sushi Cat
 * Bloons series
 * Incredibox (The original flash version)
 * Henry Stickmin (original series)
 * Riddle school
 * The Papa Louie series
 * Club Penguin
 * The World's Hardest Game
 * The Run series
 * Webkinz
 * Animal Jam
 * Happy Wheels