Phlipple is a unique puzzle game. The goal of every level is to reduce a 3D shape to a single square. Elimination of squares is done by flipping edges around just like in a cardboard box. It starts off relatively easy to teach the basics, and provides hours of brain tickling fun. It's a great way to train memory as well as orientation in 3D.
Cube Trains is a puzzle game where you build elevated railways in a city. It features 3D puzzles, unlimited undo/redo, and smart placement of pieces. The non-linear level graph means you don't have to beat a level before unlocking the next one. The game comes with a built-in level editor, so you can build and share your own corners of the city.
In Artifact of Mazes, your ship is lost in a three-dimensional maze. The only way out is to collect pieces of a strange artifact and fit them together. This HTML5 game includes custom practice modes, randomly generated mazes and puzzles, a zoomable overview map, and help screens as well as mouse, keyboard, and touchscreen support.