3DS Physics Sandbox v0.3 by pieface-

The squares fall under gravity and bounce off each other and the walls. Make new squares and walls from the touch screen, and change the gravity, bounciness and friction. Tilt the 3DS and gravity follows. The Circle Pad moves the camera, and there's a screenshot option.

It's version 0.3 and still an alpha. The author warns that the banner sound may be irritating.

3DS Physics Sandbox v0.3 Changelog

*Added support for up to 32 squares
*Added walls, immobile objects(lines) that objects bounce off of (up to 32)
-Removed square bouncing on edges of screen (by default replaced by walls in the same locations)
*Added camera, use circle pad to move view around
*Updated UI:
Now contains two columns of information, global variables and object specific variables
Change the mod_val scope to switch between these two
All data of squares and walls can be modified (position, size, etc)
Use obj_type to change between squares and walls
Use curr_view to change which object you are looking at
Use coord to change the objects position
Use vel.x/y to change the square's velocity
Use direction to change wall's direction
Use length to change the objects size
NOTE: the program stops searching through the array when it finds the first inactive object. Add new objects in order
*Press X to reset the entire world to default
*Press B to bring the currently selected square to the center of the world
*Started modularization of code
*Collision now takes momentum into account (more realistic collisions)