Go to the Passwords Menu, and type this code: ''NTTTTT''. You should have all the levels with a Golden Acorn. Go to the bonus stage (the one with the gifted bone) and press A to enter. Clear this stage and you get the same ending, but Scrat appears with the words ''The End''.
Level 2: PBBQBB
Level 3: QBCQBB
Level 4: SBFQBB
Level 5: DBKQBB
Level 6: NBTQBB
Level 7: PCTQBB
Level 8: RFTQBB
Level 9: CKTQBB
Level 10: MTTQBB
Enter at password screen.
At the code screen, type in: MFKRPH