Spear Gun Mastery Grind

Slurp! That's a wise question, hmm! It's fundamental efficiency to raise handgun proficiency first and grab that extra XP plugin. Space bugs are okay, but repeating a short segment on the Delphirion spaceship map is a more straightforward method!

Dunno...

If you equip the 'Learning Device' plugin, which you get by leveling up your handgun to level 5 on the way to Space Arena, you'll level up faster.

It might be a bit late, but there's a plugin that increases handgun proficiency by 15% when you reach level 5. If you equip that, the Space Gun's proficiency will increase by 8% each time.