Full Energy
Immediately hold Down + A + B + Select and press Start after losing a life.
Finding The Family Vault
Enter the toy chest. Move to the far left and jump while holding Left. Your character should enter into an invisible cavity in the wall. Press Up to find the family vault the money it contains.
Warp To The Last Level
Go to the second basement. Walk to the last barrel on the right and jump. Press Up when your character's feet are at almost the same height as the top of the barrel.