Some years ago voxels (volumetric + pixels) were seen in various games on the PC and Amiga. The main advantage for their use is speed thus were suited for machines such as the Amiga, where processor power is at a premium (at least in comparison to PCs).

AMRVoxel (the AMR stands for Alistair M. Robinson) is an early demo showcasing Alastair's voxel engine. As such it's less of a game and more of an engine but it is possible to drive a car across the organic landscape so it's suitable for aGTW!

Take a look at the Q&A where Alastair goes into some detail about the technical wizardry behind AMRVoxel.