Boss Rush

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"All five bosses, back to back, no waiting and no mercy."[1]

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. The par time is 12 minutes.

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.


Four things are important for scoring high in Boss Rush:

  • 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. You can afford to drop combo in the Aethersphere or during Vespula's wasp sections with not much penalty, but that's about it.
  • Not getting knocked down. Getting knocked down incurs a significant time loss, a direct Score penalty, breaks your Combo, and resets your weapon power. Unlike Daily/Infinity Drive, knockdown score penalty is not capped at 100k, so you can potentially lose millions on a single down.
  • Surging Justice with his own head in his 3rd phase.
  • Surging White Justice with his own head when he appears during the Medulla fight.

Cactus, Coral and Liquorice are good choices, as they are capable boss killers.

It should be noted that your character gains control slightly earlier than in the normal Embryo fight. This gives you extra time to reposition or Weapon Swap to your secondary. Consider using this time to move up and above Embryo in order to collect weapon power.

Ideal score[edit]

Boss / Phase Ideal total score Notes
Embryo 311,000 + 1000*10 = 321,000 Same as the regular Embryo fight, except you get a Battery afterwards. It's possible to use Vespula Wasps to build your combo up to 10x before collecting it.
Vespula 1,370,150 + 1000*10 = 1,380,150 Same as the regular Vespula fight, except you get a Battery after the final phase.
Justice 8,480,000 Already calculated out in Justice#Overview.
Venom 24000x10 + 6500*10*4 + 30000*10 + 24000*10*2 + 6500x10x8 + 30000x10 + 30000x10 + 22500x10 + 1000*10*8 = 2,705,000 Each term represents the 8 Venom phases but with a 10x multiplier, plus 8 Batteries.
Medulla Phases 1-5 135,000*10 + 135,000*10 + 135,000*10 + 135,000*10 + 135,000*10 + 1000*10*5 = 6,800,000 Quick kill bonus, 10x multiplier, 5 Batteries.
Medulla Phase 6 2000*10 + 2000*10*1.5 + 135,000*10*1.5 + 1000*10 = 2,085,000 Quick kill bonus, killing both heads, Surging second head with White Justice himself, Battery
Medulla Phase 7 150,000*10 = 1,500,000 Quick kill bonus. No Battery after this phase.
Aethersphere 54800*10*1.5 = 822,000 Surging every single mob in the Aethersphere. 54,800 is the combined base score of every mob.
Total 24,093,150
With time bonus 24,093,150 + 640,000 = 24,733,150 An amazing time to finish with both Justice surges would be about 5:20.


Icon Name Requirement Tips/strategy
I Am Become Death.jpg I Am Become Death Complete Boss Rush mode Boss Rush unlocks after you beat Medulla. Cactus is not a bad choice for the job.

Boss Rush gameplay footage[edit]

  1. IndieBox instruction manual