Beat 1-2 while getting all coins in the spring area, then enter the pipe with the piranha at the checkpoint and get to the Mega mushroom/goomba room. Then beat the level. My best is a 332, but I expect 340 to be possible.

340 confirmed, I got a 342. I don't know if 345 can be done.

GG for some reason a whole proces like that reminds me to smo tasks lol in all case cool at least 344 posible for sure you can blue shell right?

Yeah. I use fire flower and phase through the wall using a clip though.

Also, I got my inspiration for this from SMO tasks. :)