# All cars

Hit 11 Bonus Stunt items while completing Challenge 8 to unlock all cars.
# All worlds

Find the Hidden Key while completing Challenge 18 to unlock all worlds.
# All items

Intentionally hit at least 30 Barrels while completing Challenge 7 to unlock all items.
# Upgraded laser

Successfully complete Challenge 18 on the very hard difficulty setting to unlock upgraded laser.
# Infinite ammunition

Intentionally hit at least 50 Barrels while completing Challenge 18 to unlock infinite ammunition.
# Infinite health

Intentionally hit at least 179 Barrels while completing Challenge 17 to unlock infinite health.
# Infinite turbo

Collect 8 Zappers while completing Challenge 4 to unlock infinite turbo.
# Timer speed

Intentionally hit at least 60 Barrels while completing Challenge 12 to unlock timer speed.