Lollypop

To visit all parts of the game,
use these codes:

Underground A71E7U
Rainy Forrest BR3220
Spookville OFUJ5F
The Mansion QALXPH
Dreamland QWAXJ1
Frosty Land QWGJQQ
Candy Hill ONKBTP

For the CD versions, use these codes:
NCU453 CTW1PE DWMG2A N43XAZ
BWNXA9 BXBYD7 DG5VMU (Information from Cheat Machine)