In essence, Version 298 was a preservation patch. It acknowledged that the servers would eventually shut down and proactively converted the game into a fully functional offline archive. This level of developer care is rare in mobile gaming, where titles typically become unplayable bricks after EOL (End of Life).
Version 2.9.8 features the core "action puzzle" mechanics where players must quickly match tiles to power up their blasters. Slugterra: Slug it Out | App Gameplay | Part 1 slugterra slug it out 1 version 298 2021