Ices

Physics puzzles where you add or remove pieces and let gravity resolve it. There's no direct control once you've committed, so the whole game is in predicting what a change will cause.

Wake Up the Box. It introduces the physics gently and its early levels teach you how the pieces behave before anything starts demanding precision.

It reverses the premise. Instead of placing pieces you're cutting them away, so you're deciding what to destroy rather than what to build, and a bad cut is unrecoverable.

Usually a support you did not account for. These puzzles are about weight and balance, so a piece that looks decorative is often the thing holding the structure up.

Yes, all of them run free in your browser with nothing to install and no account needed before you start, and you can retry a level as often as you like.