Easy money:- Buy Score Attack 3 in a shop, then go to arrange mode A and select Score Attack 3. Choose the Mosquito 02 (the blue jet) because it is much faster then Mosquito 01. You will die in the game will have unlimited lives. No matter what happens, keep pressing R and collect as much money as possible. At the end, return to the shop and check how much money was collected. If not enough, play it again until you get enough.

Try to buy the Speed Option and Score Attack 4 in the shop. Then make it fast for your jet, by going to Special Option. Go to Score Attack and choose "Arrange" mode. Then select Mosquito 02 (the blue jet) so you can move fast. Kill everything in sight pressing or holding R to get even more money. Do not worry about dying because you will have unlimited lives while playing.

Buy Score Challenge Stage 3 and then play it under Elite Mode A. Go though the level, collecting as much money as you can. Only use your Piercing Cannon (press R) because you get more money. Do not worry about dying, because you have unlimited lives. When you get to the Boss, position yourself over his center and use your Piercing Cannon. The gold will come pouring out.

Game Shark Codes

Master Code First (Must Be On) [Note 1] 9C5D88F8
Master Code Last (Must Be On) [Note 2] 245EECA9
Infinite Credits E0E84D2F  00000005
Infinite Lives P1 B3DFE968  00000005
Quick Level Gain P1 7C129459  05F5E0FF
Infinite Lives P2 87CC5F99  00000005
Quick Level Gain P2 396F0AB1  05F5E0FF

Note 1: This code must be the first code in the list of Game Shark codes entered for this game.

Note 2: This code must be the last code in the list of Game Shark codes entered for this game. If more codes are entered after this code, then this code must be deleted and moved to the bottom of the list of Game Shark codes for this game again.