Giga Wing - 86,448,409,638,380 pts 

Giga Wing - 86,448,409,638,380 points. Character - Ruby (Carmine). All stages clear. Recorded in WolfMAME 0.104, this replay was uploaded to the MAME Action Replay Page on February 22nd, 2006.
Giga Wing is of course a game about maximizing points and making strategic use of the reflector to "go for the Giga score". While 86 trillion points sounds ridiculous, the top Japanese records for this game are in excess of 250 trillion. The sequels got even more ridiculous with the scoring, but I always enjoyed the first the most by far. I would still like to at least break the 100 trillion mark some day.