| The home computer versions came out in the UK as Tengen/Domark releases in the spring of 1990. ACE's May 1990 release box gave the Atari ST and Amiga versions at £19.99 on disk; the ZX Spectrum, Commodore 64, Amstrad and BBC versions at £9.99 on cassette and £12.99 on disk; a PC version at £24.99 on disk; and an MSX version at £9.99 on cassette, all for late April. The Games Machine's May 1990 review lists Tengen/Domark as producer, at £19.99 for the Amiga and Atari ST and £9.99 or £14.99 for the Commodore 64, Spectrum and Amstrad CPC. | p. 43 (image 43), Klax review, release boxp. 43 (image 43), Klax review, release boxp. 43 (image 43), Klax review, release boxp. 43 (image 43), Klax review, release boxp. 43 (image 43), Klax review, release box, read on the page imagep. 43 (image 43), Klax review, release box, read on the page imagep. 43 (image 43), Klax review, release box, read on the page image | Magazine |
| ACE reviewed the Atari ST version in May 1990, by Laurence Scotford, who found that Klax "is not simply a Tetris clone" and "requires more thought and forward planning" than Tetris; the review's box gives graphics 8, IQ factor 5, audio 8, fun factor 9 and an ACE Rating of 880. ACE's August 1990 issue later printed 895 as the rating of the ST version reviewed in issue 32 ("ACE Rating 895"). | p. 43 (image 43), Klax reviewp. 43 (image 43), Klax reviewp. 43 (image 43), Klax reviewp. 43 (image 43), Klax review, rating boxp. 43 (image 43), Klax review, rating box, read on the page image | Magazine |
| ACE's May 1990 review of the Atari ST version gives a vertical Klax 50 points, a horizontal one 1,000 and a diagonal one 5,000. | p. 43 (image 43), Klax reviewp. 43 (image 43), Klax reviewp. 43 (image 43), Klax review | Magazine |