Solar System

Character Used	Blindfolded
Challenge Number	6
Starting Items	Distant Admiration Forever alone Halo of Flies Transcendence
Available Rooms	: no          : yes
Goal
Unlocks	Rune of Perthro
Unlock Method	Defeat Mom's Heart 3 times

Solar System is challenge #6. Isaac starts this challenge with Distant Admiration, Forever alone, Halo of Flies, and Transcendence. Isaac will also be blindfolded. The goal is to defeat Mom's Heart. This Challenge is available after unlocking Transcendence.

Difficulty

• As Isaac is blindfolded, Isaac cannot use tears, and must rely entirely on Distant Admiration, Forever Alone, and bombs to deal damage.

Strategy

• Because Isaac starts with 3 Fly items, he will also begin the challenge as Beelzebub. This allows Isaac to amass a large quantity of friendly flies on the Basement floors.
• The orbiting attack flies can be quite powerful, especially Distant Admiration, when used properly. This will require optimization of Isaac's movement to maneuver into position to deal damage, as the flies are constantly moving, and avoid damage simultaneously.
  • Duct Tape can fix the position of the flies around Isaac, somewhat alleviating this.
• Enemies that explode on death should only be targeted with Forever Alone, as destroying them with Distant Admiration will result in Isaac getting caught in their explosions.
• Shops can carry BFFS! and Hive Mind, the former of which affects the damage of the orbiting attack flies and the latter of which affects the damage of the blue flies spawned from Beelzebub.
• Broken Watch and Stop Watch are good items to buy since they slow enemies down.
• Obtaining Gnawed Leaf makes the challenge trivial as Isaac's orbiting flies still deal damage while Isaac is invulnerable. Obtaining it is highly unlikely, however, since there are no treasure rooms present.
• Obtaining Ball of Bandages or Cube of Meat grants a full circle of projectile-blocking orbitals around Isaac.
  • Obtaining Book of Revelations makes The Harbingers easier to find, allowing Cube of Meat and Ball of Bandages to be found more often.
• It is absolutely not advised to reshuffle Isaac's items. As this will not remove Isaac's Blindfolded status, it is possible to reroll items in such a way that the run can no longer be completed.
• Obtaining the Rune of Algiz, Chaos Card or The Bible can make killing Mom and Mom's Heart/It Lives! much easier.
• Devil room deals such as Brimstone, Maw Of The Void, and Mom's Knife will be ineffective, because of the blindfolded status.
• The Boomerang is a useful purchase from the shop as it has a chance to freeze enemies, allowing Isaac to safely use the attack flies against them for the duration of the freeze.
• Transcendence and other flight items are useless in this challenge, because the Beelzebub transformation grants flight by default.
• Obtaining Bob's Brain can be handy for defeating bosses, due to its damage and poison effect. It can also be used to break poop or golden poop to gain health, coins or bombs.
• Extension Cord electrifies the orbiting flies, dealing extra damage and destroys fireplaces and poops.
• Black Powder is helpful for damaging non-flying enemies and bosses.
• Incubus acts as a replacement for Isaac's tears, thus indirectly removing Isaac's Blindfolded status.

Unlockable achievements

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Trivia

• The challenge is a reference to the Solar System; Isaac represents the sun and the flies represent planets.

The Binding of Isaac: Rebirth
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