Space Echo (set 2) appears to be a different version or revision of the Space Echo bootleg game. The 'set 2' designation indicates a potential release variation from the original bootleg, possibly with minor adjustments to the gameplay or appearance. Without further details, the differences between this and the previous version remain unclear.  More research is needed into the original game and the specific changes made in this second set.

Space Echo (set 2)

Space Bomber (ver. B)