Stunt Buggies (Quattro Arcade) Hidden Warps
Warp 1 - Stage 01 to Stage 05 - Must collect all bombs while leaving the lit bomb (just above you at the start) for last. Collecting it last will automatically give you the warp.
Warp 2 - Stage 03 to Stage 06 - Simply go to the certain tile, without collecting any bombs, and press Start.
Warp 3 - Stage 07 to Stage 10 - Make it to the top right tile, next to the final bomb, and press Start.
Note: there is a bug in Warps 2 and 3. Since you must press Start to activate the warp (hence pausing the game), you will end the stage before the game has time to acknowledge fully that you've finished pausing.
This causes a state where you are no longer able to pause for the rest of the game (since the internal pause timer never finished counting down), making it impossible to do Warp 3 after also doing Warp 2, you simply are unable to press Start during gameplay to activate Warp 3.
Credit to myself for finding Warp 1, and Dugongue and Rayquaza911 for digging and finding Warps 2 and 3.