X the Ball is easily Rare's most obscure game: You're shown a picture of a soccer game, but without the soccer ball on-screen, and the goal is to put an "X" where you think the ball is supposed to appear on-screen.
Error Screen#
If the game ever crashes, it'll display this error.
(Source: Original TCRF research)
Unused Text#
Present at 0x4 in the main CPU is part of an unused copyright:
RIGHT 1991 RARE LTDPresent at 0xFFF80000 in the main CPU is some unused text along with a build date:
THIS PROGRAM IS LICENSED BY RARE LTD. FOR USE ON THE A.C.E.S. 1 HARDWARE.
A.C.E.S. TEST RIG
COPYRIGHT 1991 RARE LTD. ALL RIGHTS RESERVED
26TH JUNE 1992