Solar System

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Solar System
Challenge number
6
Character
Isaac App.png
HUD Red Heart.pngHUD Red Heart.pngHUD Red Heart.png
Blindfolded App.png Blindfolded
Starting Items
Distant Admiration Distant Admiration
Distant Admiration Icon.pngA red attack fly circles further out than the Halo of Flies / Pretty Flies, but closer than Forever Alone. Deals more damage than Forever Alone.

Forever Alone Forever Alone
Forever Alone Icon.pngSpawns a blue attack fly that orbits a long distance from Isaac.

Halo of Flies Halo of Flies
Halo of Flies Icon.pngSpawns two pretty fly familiars that block enemy shots and deal contact damage to enemies.

Transcendence Transcendence
Transcendence Icon.pngGrants flight.

Available rooms
Item Pool Treasure Room.png: no          Item Pool Shop.png: yes
Goal
Boss Mom's Heart.png / Boss It Lives.png
Unlocks
Rune of Perthro Rune of Perthro
Rune of PerthroComplete challenge #6
Unlocked by
Solar System Defeat Mom's Heart 3 times
Solar SystemSolar System
Solar System is Challenge #6. You start off with Distant Admiration Distant Admiration
Distant Admiration Icon.pngA red attack fly circles further out than the Halo of Flies / Pretty Flies, but closer than Forever Alone. Deals more damage than Forever Alone.
, Forever Alone Forever Alone
Forever Alone Icon.pngSpawns a blue attack fly that orbits a long distance from Isaac.
, Halo of Flies Halo of Flies
Halo of Flies Icon.pngSpawns two pretty fly familiars that block enemy shots and deal contact damage to enemies.
, and Transcendence Transcendence
Transcendence Icon.pngGrants flight.
. You will also be unable to use tears. Your goal is to defeat Mom's Heart. This Challenge is available once you unlock Transcendence Transcendence
Transcendence Icon.pngGrants flight.
.

Difficulty[edit | edit source]

You start the challenge Blindfolded. You cannot use tears.

Your only means of attacking are Distant Admiration Distant Admiration
Distant Admiration Icon.pngA red attack fly circles further out than the Halo of Flies / Pretty Flies, but closer than Forever Alone. Deals more damage than Forever Alone.
, Forever Alone Forever Alone
Forever Alone Icon.pngSpawns a blue attack fly that orbits a long distance from Isaac.
, and bombs, while Halo of Flies Halo of Flies
Halo of Flies Icon.pngSpawns two pretty fly familiars that block enemy shots and deal contact damage to enemies.
provides projectile defense.

Strategy[edit | edit source]

  • Because you start with 3 Fly items, you also gain the Beelzebub bonus. This turns all enemies flies into friendly Blue Flies. On higher levels, you can amass quite a lot of them.
  • Your orbiting attack flies can be quite powerful, especially the red one. This will require maneuvering into position to deal damage, however, and they are constantly moving. Be prepared to tag your enemies and retreat so you don't take damage.
  • Shops can carry BFFS! BFFS!
    BFFS! Icon.pngIncreases the size and damage of familiars.
    and Hive Mind Hive Mind
    Hive Mind Icon.pngIncreases the size of blue spiders and Blue Flies and doubles the amount of damage they deal.
    ; the former affects the damage of your orbiting attack flies and the latter affects the damage of the blue flies spawned from Lord of the Flies. Broken Watch Broken Watch
    Broken Watch Icon.pngChance upon entering a room to slow down or speed up every enemy and their attacks. The chance to slow enemies is quite higher than the chance to speed them up.
    and Stop Watch Stop Watch
    Stop Watch Icon.pngRemoved in Afterbirth Automatically inflicts slow to all enemies in every room.
    Added in Afterbirth Upon taking damage, inflicts slow to all enemies for the current room.
    are good items to buy as well, since they slow enemies down.
  • Obtaining Gnawed Leaf Gnawed Leaf
    Gnawed Leaf Icon.pngAfter standing still and not shooting for a short time, Isaac turns invincible until he moves or shoots.
    makes the challenge trivial as you can deal damage with orbitals while being invulnerable yourself. Obtaining it is highly unlikely however, since there are no Treasure Rooms present.
  • Obtaining Ball of Bandages Ball of Bandages
    Ball of Bandages Icon.pngOrbiting familiar that deals damage to enemies. If collected while already having one, makes the familiar evolve. Only drops from Horsemen. Similar to Cube of Meat.
    or Cube of Meat Cube of Meat
    Cube of Meat Icon.pngOrbiting familiar that blocks enemy shots and deals damage to enemies. If collected while already having one, makes the familiar evolve. Only drops from Horsemen. Similar to Ball of Bandages.
    is helpful as it adds a third close range orbital to protect you from three directions.
  • Avoid any items or dungeon features that shuffle your inventory, such as the D4 D4
    D4 Icon.png6 roomsRerolls all of Isaac's items.
    , D100 D100
    D100 Icon.png6 roomsUpon use, rerolls all passive items on Isaac like the D4, every pedestal item in the room like The D6, and every pickup like the D20.
    , or Dice Rooms with 1 or 6 pips. It is possible to get stuck with no method of attack if too many of your items reroll into shooting based items. You can also be stuck with methods of attack that require you to put yourself into more danger than the attack flies you start with. You may have no alternative than to abandon your run.
  • Obtaining the Rune of Algiz, Chaos Card Chaos Card or The Bible The Bible
    The Bible Icon.png6 roomsUpon activation, Isaac gains flight, allowing him to pass over all obstacles in the current room. Instantly kills Mom, Mom's Heart, and It Lives when activated, but will kill Isaac when activated while fighting Satan.
    can be really handy in killing Mom and Mom's Heart/It Lives!.
  • Devil Room deals such as Brimstone Brimstone
    Brimstone Icon.pngTears are replaced by a laser beam that pierces through all enemies and obstacles in its path and deals high damage. Can only be fired after a short charge-up period.
    , Added in Afterbirth Maw of the Void Maw of the Void
    Maw of the Void Icon.png+1.0 Damage Up. After continuously firing tears for 2.5 seconds, a red cross appears on Isaac's head that, upon releasing the fire button, creates a black ring that rapidly deals damage equal to Isaac's tear damage to any enemies in contact with it.
    , and Mom's Knife Mom's Knife
    Mom's Knife Icon.pngIsaac's tears are replaced by a knife that pierces enemies, can travel through obstacles, and can hurt enemies while Isaac is holding it. Holding down the fire button before firing increases its range and power.
    will be ineffective, because of the Blindfolded condition.
  • The Boomerang The Boomerang
    The Boomerang Icon.png4 secondsThrows a short-range boomerang which does a bit of damage and has a high chance to stun the enemy for 2 seconds. Can also be used to grab pickups.
    is a useful purchase from the shop as it has a chance to freeze enemies, allowing you to safely use your attack flies against them for the duration of the freeze.
  • Transcendence Transcendence
    Transcendence Icon.pngGrants flight.
    and other flight items are useless in this challenge, because the Beelzebub transformation grants flight.
  • Obtaining Bob's Brain Bob's Brain
    Bob's Brain Icon.pngSpawns a familiar that charges forward when shooting tears, explodes upon contact with an enemy and poisons them. Respawns after few seconds.
    can be handy for disposing bosses. If used carefully, its damage and poison effect can make bosses much easier. It also adds the ability to break poop or golden poop to gain health, coins or bombs.
  • Added in Afterbirth Black Powder Black Powder
    Black Powder Icon.pngIsaac leaves a trail of black powder on the floor. Walking in a circle will spawn a pentagram symbol on the floor, which deals 10 damage per tick to any enemies inside it.
    is helpful for damaging non-flying enemies and bosses.
  • Added in Afterbirth Incubus Incubus
    Incubus Icon.pngA demonic familiar that follows Isaac and shoots tears identical to Isaac's in terms of damage, range, fire rate, and effects.
    will make things much easier if it is unlocked.

Unlockable Achievements[edit | edit source]

Trivia[edit | edit source]

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



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