Indie games have a knack for hiding devilish difficulty behind charming pixels. While beating the final boss might seem like the end, the true nightmare begins the moment you decide to go for 100% completion. From impossible RNG grinds to pixel‑perfect challenges that mock your very existence, these ten titles have turned completionism into a brutal art form. Grab your patience—and maybe a backup controller—because you will need both.

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10. Outer Wilds: Echoes of the Eye

Outer Wilds is a one‑of‑a‑kind exploration masterpiece, but its achievements turn the gentle time‑loop journey into a test of sheer will. Landing on the Sun Station manually or diving to Giant’s Deep’s core will make even seasoned pilots sweat. The DLC

Echoes of the Eye

dials everything up to eleven. One trophy demands you leap away from an Owlk

before

it grabs you—a feat that sounds trivial until you realize the trigger conditions are so absurdly specific you’ll never stumble upon them organically. The true nightmare? Riding a wave inside The Stranger for an extended time. It requires surgical precision with a physics‑based raft that handles like a drunk jellyfish, and each attempt demands ten agonizing minutes of setup. In 2026, it’s still a spacefaring heartbreak.

9. Risk of Rain 2

Risk of Rain 2 lures you in with addictive roguelike shooting, then buries you under an avalanche of cruel achievements. While you can grind out most unlockables, about twenty of them demand absolute perfection. Killing the final boss Mithrix with a supply beacon is a masterclass in timing and positioning—and a colossal waste of a precious resource. Sniping an Imp Overlord with the Preon Accumulator feels entirely down to luck, but the crown of agony goes to the

Ethereal

achievement: finish a Prismatic Trial as the Mercenary without being hit

once

. Since Prismatic Trials are randomized daily runs, you’re at the mercy of both RNG and the calendar. Even in 2026, this remains a test of masochistic dedication.

8. Balatro

Balatro

looks like a chill card game, but its completionist demands are pure evil. The three Completionist achievements require you to discover every single Joker, Spectral card, and planet—buying each at least once. The real horror is the final tier: you must win a run with

every single Joker on Gold Stake difficulty

, then collect a gold sticker for all of them. Considering even the best players sweat through Gold Stake runs with optimal decks, the thought of dragging a useless Joker to victory is enough to make anyone fold. This isn’t just grinding; it’s a strategic nightmare that swallows hundreds of hours.

7. Celeste

Celeste’s base game is a tough but fair precision platformer. Trying to 100% it, however, unleashes a mountain of hidden pain. Beyond completing every B‑Side, C‑Side, and the marathon Chapter 9, you’ll face challenges that weren’t even deemed worthy of Steam achievements because that would be

too cruel

. Collecting a 1‑up by carrying ten strawberries means you can barely land without starting over, and the

WOW

achievement demands extra‑stringent platforming in the farewell chapter. The real kicker? Golden Strawberries. You need to beat entire levels without dying once. It’s an optional extra that separates the mountain climbers from the masochists.

6. Hollow Knight

Hollow Knight’s hand‑drawn charm conceals Dark‑Souls‑inspired combat that becomes downright sadistic in its final challenges. The pantheon gauntlets in the Godhome DLC demand you fight increasingly beefed‑up bosses back‑to‑back. Pantheon 5 is the ultimate gauntlet: every single boss in one marathon run, with one death sending you back to square one—and the final Absolute Radiance fight will obliterate you before you can blink. Even after that triumph, achievements mock you with a 5‑hour 100% speedrun, permadeath mode, and the unholy combination:

100% permadeath

. With

Silksong

still on the horizon in 2026, the pain is far from over.

5. Terraria

Terraria is the sandbox darling that secretly wants to steal your free time. Sure, you’ll grind for hours for the Cell Phone, Ankh Shield, and Zenith—each requiring dozens of rare drops. But the 2025 addition of the 100% Bestiary achievement turned completion into a full‑time job. Farming a Nymph Banner alone is notorious; the creature spawns once in a blue moon, and you need fifty kills. As of 2026, the game’s angler quests and slime pet RNG still haunt players. It’s a crafting masterpiece where 100% means sacrificing your social life on a pixelated altar.

4. The Binding of Isaac: Rebirth

With a staggering 640 achievements,

The Binding of Isaac: Rebirth

is the Mount Everest of roguelike completionism. You need to collect every item—meaning you must defeat every boss with every character, donate entire savings to machines, and endure the RNG hell of finding five

Gulp! Pills

in a single run. Just when you think skill alone can carry you, the game demands you beat five daily challenges in a row, punishing even a single failure. Even in 2026, with all the expansions, it remains a game where a couple of hundred hours barely makes a dent.

3. Stardew Valley

Don’t let the cozy farming fool you—Stardew Valley’s road to Perfection is paved with relentless deadlines. Reaching max friendship with every villager, shipping every item, and blowing 13 million gold on endgame structures is just the warm‑up. The true villain is the

Journey of the Prairie King

arcade cabinet. To get every achievement, you must beat this twin‑stick shooter

without dying once

. It’s so brutally precise that even the developer couldn’t do it for ages. In 2026, countless players still abandon their idyllic farms because of that cursed minigame.

2. Cookie Clicker

Don’t be fooled by Cookie Clicker’s idle‑game appearance—its 637 achievements demand a spreadsheet, reflexes, and a staggering amount of real‑world time. Over 8% of them require elaborate Golden Cookie combos: you’ll sell entire buildings, take out loans, and summon cookies in rapid succession, all while praying for just the right buffs. Even with the most optimized build, the final achievements would take centuries of idling. As of 2026, the game has been open on someone’s second monitor for over two thousand hours—and counting.

1. Tower Unite

Tower Unite is the social MMO party paradise that secretly houses the most insane completionist grind in gaming history. With 651 things to unlock and a breathtaking 0.0% average completion rate on Steam, it asks you to master everything—from 67 mini‑golf hole‑in‑ones to scoring 5,000 notes on a piano arcade machine. Sure, some tasks are simple, like visiting a friend’s condo, but the sheer breadth and depth of challenges mean even the most dedicated players throw in the towel. As of 2026, if someone claims to have platinumed Tower Unite legitimately, don’t believe them. They’re probably still asleep in the arcade.

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🎯 The Verdict

These ten indie gems prove that 100% completion isn’t for the faint‑hearted. Whether it’s pixel‑perfect platforming, merciless RNG, or multi‑year idle marathons, they’ll test your sanity long after the final boss falls. Choose your poison wisely—and don’t forget to take breaks, because these games certainly won’t.