It's just a small step from the arcades to the Spectrum, as Incentive (0734-591678) intends to demonstrate with Moon Cresta. It has bought the licence to transfer Nichibutsu's arcade game on to any personal computer, starting with the Spectrum and the Commodore 64. The company is offering a prize to the first player to score 30,000 points - the original arcade machine. The cassette version costs £6.95.