Atama no taisou

Long before Dr. Kawashima's Brain Training, there was the Atama no taisō (Brain gymnastics) series. Made up of three miniature games, the X1 version purports to train your abilities of reaction, memorisation and spatial thinking.

Limit 0.x s is a reaction game where you are presented with sixteen panels where a heart symbol appears at random intervals, upon which you must press a key before it disappears. Sometimes, a human figure appears instead, whereupon you mustn't press that key. Score is awarded according to how fast you press the key, with bonus scores if you mark rows or columns of panels.

Box 26 is a memory game where you must find the letters of the alphabet between 26 boxes in the correct order by moving a little human figure around the screen. The time limit is 300 seconds.

Block 888 presents a cube made up of 8 x 8 x 8 transparent blocks (512 in total), viewed from three axes. Some blocks are blue, and you must count those blocks.