Algodoo

Credit to all. Here's another useful marble pack!
Holders for 3-30 marbles made by Viadszz
Holders for 1 and 2 marbles made by me
Teleporter elimination: Idea by multiple people and made by me
Single elimination made by Luka and modified by me
Double and triple eliminations made by Viadszz and modified by me
4-elimination made by me
Both examples: made by me
Path by Viadszz, and last, but not least, Walls made by me.
If you use the holders for 2 or 1 marbles or the teleporter elimination, you don't need to give credit (It would be nice if you did) but you need to give credit to Viadszz if you use the holders for 3-30 marbles or the double/triple eliminations, and give credit to Luka if you use the single elimination.