Should I Play The Binding of Isaac? The Roguelike That Defined a Genre

What It Is

The Binding of Isaac: Rebirth is a top-down roguelike action shooter designed by Edmund McMillen and developed by Nicalis, Inc. It launched on November 4, 2014 as a complete remake of the 2011 Flash original, swapping out the wonky web tech for a custom engine that could actually handle the scope McMillen wanted. It costs $14.99 on Steam and frequently goes on sale for under $5.

You play as Isaac, a naked crying child whose deeply religious mother decides God has told her to sacrifice him. Isaac escapes into the basement, where he fights enemies that look suspiciously like his own mental projections of guilt, shame, and family trauma, using his tears as bullets. Each run is a randomly generated descent through 8 to 13 floors, picking up items that warp Isaac’s body and stats in dramatic, often grotesque ways.

The base game has an Overwhelmingly Positive rating on Steam with 340,000+ recommendations. Across its four expansions (Afterbirth in 2015, Afterbirth+ in 2017, Repentance in 2021, and Repentance+ in 2024), the game now contains 700+ items, 34 playable characters, and somewhere around 18 alternate endings depending on which routes you unlock. McMillen has been adding content for over a decade and shows no sign of stopping. He recently released Mewgenics, but the man clearly cannot leave Isaac alone.

Why You Should Play It

Item synergy is the hook, not difficulty. Most roguelikes ask you to get better at one tight loop. Isaac asks you to learn 700+ items and figure out which combinations break the game. Pick up the Wafer in a run with Brimstone? Now you fire a continuous laser of death and take half damage. Pick up Tiny Planet with Ipecac? Your tears orbit you like exploding satellites. There is a real chemistry to the item pool, and finding broken combos is where most of the long-term joy lives.

The runs are short. A clean win takes 30 to 50 minutes. A character unlock can happen in 20. Compared to roguelikes like Slay the Spire or Hades that expect 1+ hour commitments per run, Isaac is the genre’s perfect lunch-break game. You can play one floor, save and quit, and pick up exactly where you left off. Few roguelikes get that loop right.

The unlock tree is a 12-year backlog. New players are not expected to see everything in 50 hours, or 200, or 500. Steam tracks players with 2,000+ hours in this game. The post-game content (Greed Mode, the Lost, Tainted characters, alternate endings, secret bosses, the Delirium fight) keeps revealing itself for years. If you like games that reward obsession, Isaac will outlast most marriages.

It built the modern roguelike playbook. Procedurally generated rooms, permanent meta-progression unlocks layered on top of run-based progression, the run-modifying item pool. Hades borrowed the structure. Enter the Gungeon borrowed the format. Dead Cells refined it. Nearly every “roguelike-lite” since 2014 owes something to what Isaac figured out. If you want a deeper genre map, our best roguelike indie games list shows the lineage.

The price-to-content ratio is absurd. $14.99 for a game with 12 years of content updates. The Repentance expansion alone (which is the version most people should buy alongside the base game) added 130+ new items and a whole alternate path. You will not find a better value-per-hour in indie gaming.

Why You Might Not

The visual presentation is intentionally gross. Isaac is a crying naked child fighting bloody fetus monsters in a basement. The art style leans into Christian guilt iconography, body horror, and bathroom humor. McMillen’s design lessons article explains the why, but the why does not change the what. If you cannot stomach the aesthetic, the game has nothing else to offer you.

The early hours are the worst hours. Before you have unlocked many items, runs feel thin. The game’s brilliance is in the synergy chaos that emerges from a deep item pool, but that pool is gated behind dozens of hours of unlocks. The first 10 hours can feel like a lesser version of the game most players are recommending.

The story is mean. Isaac’s narrative arc is a mother attempting to murder her child for religious reasons, framed through the perspective of the child’s collapsing mental health. Some endings are genuinely upsetting. If you play games to feel good, this is not that game.

Repentance changed the meta hard. The 2021 expansion rebalanced item pools, added a second alternate path, and made the game noticeably harder. Veteran players from the Afterbirth+ era either loved or hated the changes. New players walk into the post-Repentance balance with no baseline, which means some old strategy guides you find on YouTube are out of date. Use the Isaac Wiki for current info.

My Take

I have something like 400 hours in this game across multiple platforms and I am still not done with it. That is the Isaac trick. You think you are going to play 20 hours and move on. You unlock the Lost. You start the Hard Mode runs. You discover the Tainted characters. Suddenly it is three years later and you are still chasing the Dead God achievement.

The thing nobody tells you about Isaac is that the early hours are misleading. The game shows you a fraction of what it actually is. It earns your patience by gradually opening up an item pool, character roster, and alternate path system that turns each run into a different game. By hour 50, you are not playing the same game you played in hour 1. By hour 200, you are not playing the same game you played in hour 50.

What it does that few games still do: it respects that you might be a deep nerd. The community has spent over a decade decoding Isaac’s secrets, and the game keeps rewarding that obsession. Hidden bosses, alternate endings, item interactions that work in ways the manual would never tell you. There is a reason BOI runs occupy a permanent spot on Twitch’s roguelike rotation.

If you have never played a roguelike before, Hades is probably the friendlier on-ramp. If you have already played most of the modern indies and want to understand where the genre actually came from, this is required.

You should buy Rebirth + Repentance together. Skip Afterbirth and Afterbirth+ as standalone purchases unless they are bundled cheap. The game gets better the more it has installed.