Upgrades in CrossWorlds unlock new abilities and menus for players to use. Official CrossWorlds upgrades come with fancy upgrade platforms and flashy effect sequences. Lea receives several of her upgrades unofficially from Sergey, which lack the effects, showing that this is purely cosmetic. Sergey also uses special upgrades to hard-code Lea's speech module with new words.
The following table lists all upgrades in the typical order obtained. All upgrades are mandatory unless specifically specified otherwise.
|Name||Purpose||How to Get|
|Charge Mode||Unlocks the use of Charged Balls||Given by Sergey during the initiation sequence on the M.S. Solar|
|Dash||Unlocks the use of Dashing||Given by Sergey during Carla's obstacle course on the M.S. Solar|
|Melee||Unlocks the use of Melee||Given by Sergey during Carla's obstacle course on the M.S. Solar|
|New Word: Hi||Allows Lea to say "Hi"||Given by Sergey while on the M.S. Solar|
|Guard||Unlocks the use of Guarding||Given by Sergey during Jet's training on the M.S. Solar|
|Quickmenu||Unlocks the Quickmenu, with Use Item and Map submenus||Obtained while completing the Rhombus Dungeon|
|Character Menu||Unlocks the Character Menu, with Inventory, Equipment, Map and Options submenus||Obtained while completing the Rhombus Dungeon|
|Circuit||Unlocks the Circuit submenu||Obtained while completing the Rhombus Dungeon|
|New Word: Lea||Allows Lea to say "Lea"||Given by Sergey at the end of the Rhombus Dungeon|
|Synopsis Menu||Unlocks the Synopsis submenu||Obtained on reaching Rookie Harbor|
|New Word: Bye||Allows Lea to say "Bye"||Obtained after the first fight with Apollo|