• After you clear 23 stages, the O'Wolf Delivery feature is unlocked.
• After you clear a stage, normal items are randomly placed on the board of the next stage.
• After you clear a stage, the next stage's board will feature a rocket and RC plane. If you clear a second stage without failing, the following stage's board will feature a rocket, RC plane, and bomb. If you clear a later stage without failing, the following stages' boards will feature a rocket, RC plane, bomb, and roulette wheel.
• If you fail a stage, O'Wolf Delivery resets, and the upgrades start from the beginning again.