An elderly conversion of an even more crusty Atari coin-op which places you in the furry skin of Bentley, a bouncy bear with a fetish for precious stones. Today, Bentley's ambled into a witch's castle which is made up of eighteen 3D mazes, all littered with gems. Cor! Poor Bentley nearly wets his knicks in excitement, and before you can say "Hold it, Bentley! The place is full of mad marbles/tree spirits/skeletons/gem eaters/bees", he's out there filling his pockets.
On the Spectrum at least, Crystal Castles is quite good fun, but not at all difficult, mainly because it's a bit slow. The best that can be said about the graphics is that they're clear, and there are a couple of beepy jingles which pop up now and again.
All in all, not tops, but a "bear"able budget buy (yuk yuk!).
Spectrum
A tidy arcade conversion, playable enough to keep you occupied for an hour or two.