One suggestion, replace Gravity Force 2 with Gravity Power
Quote taken from the official Gravity Force 2 Homepage
The final version of Gravity-Force 2, "Gravity POWER" was made for the magazine Amiga POWER. It has all the features of v1.10 (the registered version with serial link-up option) and some extra stuff & levels. As Amiga POWER doesn't seem to be around any more (sad but true), Gravity POWER can now be downloaded here.