Algodoo

You can do 1 of 2 things.
1. Sign up for the UMR.
2. Send me a UMR Race
Here's option 1's rules:
1.1. You can pick a normal and a secondary color (in the correct order).
1.2. You cannot pick a color that is already signed up for.
1.3. You can send me other stuff in your comment.
Here's option 2's rules:
2.1: You must make a marble race with at least 5 legs per part.
2.2: You must send me the link to it via Discord (here's the link to my discord server: https://discordapp.com/channels/213328907515068416/213328907515068416 . Join it and go to "#the-ultimate-marble-race-sign-ups")
2.3: I will test the marble race.