@Yehuda ... yeah. Ever since greenfoot transitioned to converting to javascript, UserInfo images have been "unobtainable?" and collection thumbnails fail to set. UserInfo images probably are still fine in legacy version, however.
You will have a major issue with grid worlds. The Camera class constructors would take a (20, 20, 60) world and make a Camera of (600, 400, 60) -- much larger than the world it is looking at.
2020/5/1
Maze Challenge
2020/4/25
Basic 3x3 Cube
2020/4/25
Basic 3x3 Cube
2020/4/2
Asteroids w/improved QActor SuperClass
2020/4/2
Asteroids w/improved QActor SuperClass
2020/3/26
Basic 3x3 Cube
2020/3/25
Sliding Puzzle
2020/3/24
Camera package
2020/3/21
Basic 3x3 Cube