It's been brought to my attention that there are some differences between the the US and JP version that necessitates a split. Lets get some more runs in to fill up those boards. GLHF

Update: (Copied from https://www.gamesdatabase.org/mame-rom/rygar) The differences between the US (set 1) and US (set 2) are :

• 'Set 2' has a bug in the code which lets p2 start a game when p1 is already playing. You need to set a dip-switch to enable this behavior (it is usually on by default). If you press '2' while p1 is playing a single player game, 'Set 2' will check that you have 1 or more credit before it registers that you're now in a 2 player game, but it won't deduct the credit. That's a bad bug and probably accounts for why a bug-fix version was released.

• In 'Set 2', if p2 starts while p1 is already playing, it says 'playre2' instead of 'player2' at the top right.

• The first screen of 'Set 2' says 'ALL RIGHT RESERVED' - missing an 'S' - that's fixed in 'Set 1'

The differences between the US and Japanese (Argus no Senshi) are :

• The demo sequences are different.

• The Japanese version seems to have more hidden powers, stars and an extra free life.

• The US version is more biased towards stars and explosions.