Boss Rush

"All five bosses, back to back, no waiting and no mercy."

Boss Rush is a mode that unlocks after defeating Medulla. It becomes the fourth option in the "Play" menu, after Daily Drive.

The premise is simple - fight Embryo, Vespula, Justice, Venom and Medulla back-to-back, in that order. This takes about 10 minutes for a typical successful run, though sub-6 minute times are possible.

As soon as a boss is beaten, the next one immediately spawns in. The arena opens up for Venom, then closes again for Medulla. Score, Combo, weapon reinforcement level, and any Batteries or Powerups on the ground are conserved between boss changes.

The run ends when you run out of Battery or when Medulla's Aethersphere phase is defeated. Only successful attempts receive a leaderboard score and a Rank. Players are ordered on the leaderboard by score only.

Strategy
Three things are important for scoring high in Boss Rush:


 * Completion time.


 * Holding Combo. This is obvious, as it determines your score multiplier when defeating each boss section. When aiming for score, dropping Combo at any time is an instant restart.

Cactus tends to do the best out of the androids, as she is competent for every boss and her flame-thrower secondary is the most powerful in the game.
 * Surging Justice with his own head for the final phase. No other boss can be surged.