Upgrades

 are items you can use to enhance the stats of the player character or your bots. They use upgrade slots, the slots to the far right in the inventory screen.

Player upgrades
The player has 4 upgrade slots available. There are three kinds of upgrades, and there are three levels of each.
 * Crude Backpack Upgrade (backpack level 1)
 * Good Backpack Upgrade (backpack level 2)
 * Super Backpack Upgrade (backpack level 3)
 * Crude Scooter (movement level 1)
 * Skateboard (movement level 2)
 * Trike (movement level 3)
 * Duck Call (whistle sound)
 * Train Whistle (whistle sound)
 * Party Blower (whistle sound)

Bot upgrades
See Bots.