One of my favorite games on the Amiga was a simple clone of Tetris set in a 3D environment, Blockout. Various iterations have occurred down the line, but 'Tetra3D - A 3D Game' by GeniApps is one of the first I've seen for the App Store.

Unlike other 3D-Tetris variants, Tetra3D is set in an isometric view which presents a few problems, the first of which is a blocked point of view while the blocks fall. Thankfully the game corrects this flaw by allowing the block to hover above the 3D space while a countdown ticks over, dropping immediately in to the field if you're not prepared. Two buttons allow you to change the perspective orientation, while three other buttons provide access to rotating the current block on each axis. Positioning the blocks is also easy, with a simple swipe allowing you to direct it up and down or across the field.

Wrapping your head around the 3D gameplay can be challenging, but thankfully the visuals are clear and easy to follow, with varied colors for each tier and a smooth black space background to help the blocks stand out. While there's only one game mode, players can customize the grid size, starting level and block set to their liking.

The only real downside is the frustrating 'tutorial' which callously tells players to search for it on YouTube, but Tetra3D is simple enough to not really warrant a complex guide. Tetra3D is a great implementation of a simple twist on Tetris and worth picking up for fans of unusual puzzle titles.