Stealing Covenant weapons and giving their owners a taste of their own medicine never gets old. Some alien guns feel downright clumsy compared with human gear, but that's half the charm. The rechargeable shield is another neat touch: retreat for a moment, get your bearings, and charge back into the firefight. This fan-made Android conversion uses the more detailed PC release, with the full game content unlocked. Its 30 missions throw in Warthog action, Kestrel flights, and plenty of Promethean trouble. The city and jungle scenery looks much better than in the old mobile version, too. It's loud, occasionally frantic, and good fun when the screen fills with enemies.