How To Get Physics to Restrict Liquid?

There is no Physics in your game, it uses Bullet behavior.

Make the borders much thicker. You can use a different invisible sprite with Solid behavior for borders.

Thanks for looking. I was trying some alternate methods after reading up on physics and forces (didn't realize I was working on the shared file). But whether using physics or solids and bullets, the outcome is the same: as soon as the barrier objects are moved, the ball objects flow outside the barriers.

My hope was to eventually create a maze of sorts, so the thicker barriers are not ideal, but I'll give that a go. Given what I'm trying to do, what is the better approach: physics, or bullets and solids?

You can remove Bullet+Solid behaviors and replace them with Physics. The key part is to set "Bullet=yes" in Physics properties for all objects, then the water should not fall through borders.

netdzynr Yeah, I forgot to mention - with Physics you can't use non-physics behaviors and actions to move objects. No pin, no "set angle". This is the reason why your water is escaping.

You can only move and rotate objects with physics actions like "set velocity", "apply force" etc.

To tell you the truth, I don't see a simple way to make a rotating closed box entirely with physics.. Maybe somehow connect all sides with distant joints.

Colludium Your plugin looks awesome!