Have you tried Algodoo on your phone? What is the coolest contraption you've built? Let us know in the comments!
It utilizes a free-hand drawing mechanic where whatever you draw immediately becomes a physical object in the simulation. Algodoo Play Store
Algodoo was originally born from a university project called "Phun." While the original Phun is no longer developed, several indie titles on the Play Store replicate its colorful, cartoonish aesthetic and soft-body physics mechanics. Search for "2D physics sandbox" to find the latest highly-rated indie projects. 3. Powder Game / Sandbox Elements Have you tried Algodoo on your phone