"Unlockable weapons" refers to weapons or tools that can be accessed or obtained by completing certain requirements or objectives within a video game or similar context. Full definition
The game also has a decent array of unlockable weapon upgrades, wheel upgrades and costumes. (plusxp.com)
The four - player WiFi mode lets players go head to head, while unlockable weapons, vehicles and upgrades add even greater depth to the gameplay experience. (metacritic.com)
So with 29 playable characters, over 30 stages, the main Legend Mode including a side story for Linkle, Cia, and Wind Waker, countless unlockable weapons, items, costumes, Challenge Mode, Adventure Mode and even split screen coop, (switchplayer.net)