Boss Battle mode - Collect all ten snow boys in any stage. The stage you collected all ten will unlock Boss Battle mode for the Boss of that stage.

Collecting Snow Boys - To find Snow Boys look for a place where a small amount of snow is falling and use the Blizzard attack. This will reveal Snow Boys. There are ten in every stage.

Hard mode - Successfully complete the game and view the ending sequence. You will start back at stage 1 with all the snowflakes and lives you had when you completed the game, except that minor enemies like snowmen with blue caps will shoot a fireball at you immediately after they are killed, making the game much more difficult.

Stage select - Successfully complete the game.