Algodoo

Credit to Luka and MarbleRaced for tools/marble packs.
Please read the big floating greenish box for info.

UPDATE (v1.0.1): Includes enhanced marble pack

UPDATE (v1.1): Includes new (and improved) name, fixed bug where "Magenta" marble did not appear after update 1.0.1, description no longer says the box is Olive-Green

UPDATE (v2.0): Marble 500 is now has now been revamped with the new series name "SMR". This scene was originally Marble 500 Season 1 Episode 1. It is now a sneak peak marble race episode scene for the new and improved SMR.

UPDATE (v2.1): Bug fixes, pick which marble pack you want