Welltris, Alexey Pajitnov's puzzle game, saw various arcade releases with differing specifications. The 'World?' designation in the title suggests a version potentially intended for international distribution, unlike the Japan-specific release. It retained the core gameplay of its predecessor: manipulating falling wells to clear lines and achieve high scores. The inclusion of two-player mode enhanced replayability and competitive elements. This variant's global presence remains unclear without more extensive archival data on the arcade market at that time.

Welltris - Alexey Pajitnov's (World?, 2 players)

Water Balls