The Binding of Isaac: Repentance Guide#
The Binding of Isaac is a roguelike shooter developed by Edmund McMillen, inspired by The Legend of Zelda. You play as Isaac, a naked child who fights monsters with his own tears, collects hundreds of items across randomly generated dungeons, and takes on the final boss.
Platforms: PC, PS4, PS5, Xbox, Switch, iOS | Release Date: November 4, 2014
Game Information#
| Item | Detail |
|---|---|
| Game | The Binding of Isaac: Repentance |
| Developer | Nicalis / Edmund McMillen |
| Designer | Edmund McMillen |
| Genre | Action Roguelite |
| Story | Dark biblical themes — Isaac flees his mother’s murderous rampage and retreats into a basement fantasy world |
| Total Items | 700+ (with DLC) |
| Playable Characters | 34 (including hidden characters) |
| Bosses | 100+ |
| Highlights | Massive item combos, open route choices, endless replay value |
Core Features#
| Feature | Description |
|---|---|
| Item System | The core driver — 700+ items, each one changes your abilities. Items react with each other: some combos are absurdly strong, others will kill you |
| Room Types | Normal rooms, boss rooms, shops, treasure rooms, vaults, curse rooms, secret rooms, angel/devil rooms — each with its own rules and rewards |
| Route Choices | Paths are never fixed — you can skip rooms or explore hidden ones. Item picks plus route planning are the strategic core |
| Hearts and Health | Red hearts (health), soul hearts (blue, depleted first), black hearts (poison damage when destroyed), bone hearts (don’t lower devil deal odds) — managing health is key to survival |
| Devil Room vs Angel Room | After each boss there is a chance of a devil room (trade health for power) or an angel room (free, but usually requires refusing devil deals) — the game’s core gamble |
| Item Pools | Every room type draws from its own pool — shop, treasure, boss, devil room, and more. Understanding pools lets you farm targeted items |
| Challenge Mode | 34 runs with special rules — completing them unlocks new items and achievements |
Getting Started: Seven Tips#
| # | Tip | Explanation |
|---|---|---|
| 1 | Speed First | The maps are big and the rooms are many — slow movement wastes time and gets you hit. Grab movement speed items first |
| 2 | Are Devil Deals Worth the HP? | Early game: no (you don’t have the health). Mid game: yes (strong items keep you alive). Never trade below 3 hearts in the early floors |
| 3 | Prioritize the Map | Buy the map or compass in the shop — knowing where secret rooms are means extra items and resources |
| 4 | Item Pool Strategy | Don’t want a junk boss room item? Clear treasure rooms first — the boss item pool is usually the best |
| 5 | High Damage Beats High Fire Rate | Early damage items pay off far more than tears up; fire rate can be patched in later |
| 6 | Trap Items to Avoid | Soy Milk, Milk! (unless you have healing), Tech X (the crosshair laser takes getting used to), and the Chaos Card (random item pool, extremely unstable) |
| 7 | Secret Room Patterns | Secret rooms usually connect 3 or more rooms (between treasure, shop, and boss rooms) — bomb walls marked with an X |
DLC Expansions#
| DLC | Release Date | New Content |
|---|---|---|
| Afterbirth | October 30, 2015 | Greed mode + new characters + new bosses + new item tiers |
| Afterbirth † | January 3, 2017 | Item pool adjustments + new challenges + mod support |
| Repentance | March 31, 2021 | The ultimate update — a mountain of new items, bosses, characters, and routes |
Route System#
There are multiple completion routes — the right one depends on your items and health.
| Route | Requirement | Final Boss | Difficulty |
|---|---|---|---|
| ??? / Blue Baby | Unlocked after defeating Mom’s Heart 11 times | ??? (Blue Baby) | Medium |
| Satan | Take the devil deal offered after defeating Mom’s Heart | Satan | High |
| Isaac | Refuse devil deals, then defeat the angel in the angel room | Isaac | High |
| The Lamb | After defeating Satan — enter the Dark Room | The Lamb | Very High |
| The Chest | After defeating Isaac — enter the Chest floor | ??? (Blue Baby) | Very High |
| Greed | Greed mode | Ultra Greed | Medium |
| Greedier Mode | Unlocked after defeating Ultra Greed | Ultra Greedier | Extreme |
| Hush | Defeat Mom’s Heart within 30 minutes — unlocks the Blue Womb | Hush | Extreme |
| Delirium | After defeating Hush, descend into the Cave — the most complex route | Delirium | Extreme |
| Witness → Beast | New in Repentance — collect 4 specific items within 2 floors; extremely hard to unlock | The Beast | Ultimate |
Advanced Techniques#
| Technique | Description |
|---|---|
| Item Pool Exploitation | Not happy with the current pool? Open chests in other rooms first — the boss room pool is usually the best |
| Angel Room Safety Net | Keep refusing devil deals (don’t trade, don’t enter) — the next floor has a high chance of spawning an angel room |
| Health Management | Soul hearts (blue) deplete first — protect your red hearts for devil room trades |
| Bomb Usage | Bombs reveal secret rooms, crack open golden chests, and clear rocks. Hold to aim — you can even dig certain items out of walls |
| Card Usage | Different cards shine in different moments — the Strength card early on is a free damage item, and the Devil card in a devil room directly trades for a powerful pickup |
| Character Selection | Different characters fit different routes — Isaac (angel route), Judas (devil route), Lilith (Greed mode) |
Character Unlocks#
| Character | Unlock Condition |
|---|---|
| Isaac | Unlocked from the start |
| Magdalene | Defeat Mom’s Heart at least once with Isaac |
| Cain | Defeat Mom’s Heart with Magdalene |
| Judas | Defeat Mom’s Heart with Cain |
| Eve | Defeat Mom’s Heart with Judas |
| Samson | Reach the second floor without picking up any red or soul hearts |
| Azazel | Defeat Satan with 3 different characters |
| Lazarus | Defeat Mom’s Heart with 4 different characters |
| Tainted Cain | Unlocked via its dedicated achievement; the exact requirement varies by version |
Game Modes and Difficulty#
| Mode | Description |
|---|---|
| Normal | Standard drop rates — the default Isaac experience, randomly generated dungeons, beat the boss to win |
| Hard | Lower item drop rates, tougher enemies — but clearing it unlocks special achievements |
| Greed | Wave-based survival in a fixed room layout — enemies get stronger each wave, ending with Ultra Greed |
| Greedier | An extreme version of Greed — denser enemies, stronger bosses |
| Daily Challenge | A fixed seed every day — every player gets the same run, leaderboards compare scores |
| Challenge Mode | 34 runs with special rules — completing them unlocks new items and achievements, with a wide difficulty spread |
Achievements#
| Type | Count | Description |
|---|---|---|
| Completion | ~20 | Clear each route with each character |
| Collection | ~30 | Full item, card, and pill collections |
| Challenges | ~34 | Complete every challenge run |
| Hidden | ~20 | Special conditions — requires exploration |
| Total | 100+ | Expect 200-500 hours for full completion |
Item System Deep Dive#
| Concept | Description |
|---|---|
| Item Pools | Each room type has its own pool — shop, treasure, boss, devil room, and more. Understanding pools means knowing where to farm what you need |
| Item Quality | Repentance introduced a 1-4 quality system — quality 4 items are the strongest in the game (Godhead, Brimstone, etc.) |
| Item Synergies | 700+ items produce countless reactions — some combos transform your run (Brimstone + Tech X = a full-screen laser) |
| Active Item Charging | Active items need charges to fire — clearing rooms, taking damage, and picking up batteries all recharge them, and different actives need different amounts |
Popular Builds#
| Build | Core Items | Playstyle |
|---|---|---|
| Tear Build | High tears + damage items | The traditional approach — the most direct |
| Brimstone Build | Brimstone + tears + damage | Charged mega laser — clears the screen |
| Technology Build | Tech X + Technology + tear upgrades | Orbiting laser plus homing — high damage |
| Familiar Build | Box of Friends + Adoration + duplication items | Your familiars deal the damage while you focus on positioning |
| Explosive Build | Brimstone + Tech X + Explosivo | Bombs, explosions, and destructive weapons — high risk, high reward |
FAQ#
Too many items to remember?#
Bookmark Platinum God, the community item tracker, for real-time lookups mid-run.
Devil room or angel room?#
With plenty of HP, take the devil room and trade health for power; with low HP, take the angel room — the rewards are free but slightly weaker.
When should you abandon a run?#
If you reach the second floor with no core items or dangerously low health, just restart — nothing to be ashamed of.
Which character is best for achievement hunting?#
Azazel — flight plus Brimstone gives him the fastest clears in the game.
How many items and characters are there?#
Over 700 items and 34 playable characters, hidden ones included, plus more than 100 bosses.
What does Repentance add?#
The March 31, 2021 expansion piles on new items, bosses, characters, and routes, and introduces the 1-4 item quality system.
Which route is the hardest?#
The Witness → Beast path added in Repentance is rated ultimate difficulty; Delirium and Greedier mode are close behind.
Related Games#
- Red Dead Redemption 2 — the pinnacle of western open-world action-adventure
- Bloodborne — a gothic horror soulslike action RPG
- Minecraft — the timeless sandbox survival classic
- The Elder Scrolls V: Skyrim — an eternal open-world RPG classic
- Hades — a Greek mythology roguelike action game
Related Rankings#
Best Roguelike Games · Best Indie Games of All Time · Hardest Bosses in Gaming · Best Indie Games of 2026
Full Guides#
In-depth sub-guides — beginner basics, item and card encyclopedias, full character breakdowns, boss strategies, hidden routes, challenge mode, tainted characters, room guides, devil and angel room mechanics, local co-op, dice and special rooms, daily challenges, speedrun routes, transformations, trinkets, and unlock guides — are available in Chinese on NTGame’s The Binding of Isaac section.