Klonik

Klonik is a take on the light-cycle duels from Tron: each player leaves a solid trail behind them, and whoever hits a wall first loses. The Portuguese programmer Diogo Lapa ported it to the Game Boy Advance in 2002 from a Linux original by a developer going by Tareco, and distributed it with source code from his personal site, which is no longer online.

What survives in the archived item is a bare 15 KB klonik.gba ROM. That alone makes it one of the very few Portuguese console releases from before 2003 that anyone can still play today — including here on OldGame.cz, directly in your browser.