Zanac by the Compile studio from 1986 is one of those games that earned its reputation not through graphics or story, but through an ingenious idea hidden beneath the surface. At first glance it's a fast vertical shooter, of which there were dozens on the MSX — but in reality it was a pioneer of so-called adaptive difficulty, a system that quietly watched how well you played.
The game's artificial intelligence, which Compile called ALC (Automatic Level of Difficulty Control), reacted to your playstyle: how fast you shot, how you moved, how many enemies you destroyed. When you were doing well, the game cranked up the pressure and threw more opponents at you; when you were struggling, it eased off for a while. Thanks to that, every run was a little different and the game adapted to you personally. On top of that, Zanac offered a rich arsenal of secondary weapons, which you switched between on the fly depending on the situation.
For retro players, Zanac remains a textbook example of how Compile — later the creators of the legendary Aleste series — knew how to breathe depth into a shooter. Its briskness, clever design, and timeless adaptive-difficulty mechanic make it a title that holds up even next to far newer shmups.
Game 28 of 29 for MSX / MSX2
