We have 2 cheats and tips on GBA. If you have any cheats or tips for GT Advance 3: Pro Concept Racing please send them in here. You can also ask your question on our GT Advance 3: Pro Concept Racing Questions & Answers page.
You will be surpised for these cheats but I'm not telling you:
L,B,Left
L,B,Up
L,B,Down
L,B,Right
Good Luck!