What is the Hardest Game to Fully Complete?

We’ve all been there: that one impossible jump in a Super Mario game that makes you want to launch your controller. Now, imagine an entire game designed to feel like that moment, over and over. But the true test of the world’s hardest games isn’t just surviving to see the credits roll. We’re exploring a far deeper, more demanding challenge known as “100% completion.”

Finishing a game’s main story is one thing, but defining video game completionism means doing everything the creators hid inside. For players of The Legend of Zelda: Breath of the Wild, this famously includes finding all 900 hidden “Korok seeds” scattered across its massive world. This is the real challenge, where beating the final boss is only the beginning of the journey.

So, what makes a game difficult to finish? The answer isn’t simple, because difficulty comes in three main flavors. Some games demand incredible Skill, requiring split-second reflexes to survive. Others are a test of pure Time, asking you to spend hundreds of hours on a single task. And then there are games that hinge on sheer Luck, making you roll the dice for that one final item.

Because of these different mountains to climb, crowning a single “hardest game” is nearly impossible. A game that’s the ultimate test of reflexes is a completely different beast from one that’s a marathon of patience. Instead, we have to ask a better question: what are the hardest games for skill, for time, and for luck?

The Wall of Skill: Games That Demand Perfect Reflexes

We’ve all played games where you can win by mindlessly attacking a boss until its health bar empties. But a true “wall of skill” game throws that idea out the window. Imagine a sword fight where swinging wildly is a death sentence, and survival depends entirely on your defense. This is the heart of infamous titles like Sekiro: Shadows Die Twice, where you must learn to parry—deflecting an enemy’s blade at the perfect instant. It turns brutal combat into a deadly, high-speed rhythm game where one wrong beat means you’re finished.

This focus on perfect timing introduces a completely different goal. Instead of chipping away at an enemy’s health, you’re trying to break their Posture, which works like a balance meter. Every successful parry fills this meter until the enemy stumbles, leaving them vulnerable to a final, decisive blow. The terrifying catch is that a single missed block or taking one hit can erase all the progress you just made, forcing you to restart the dangerous dance from the beginning. Minutes of flawless play can be undone in a single second.

So why would anyone subject themselves to this? The reward for climbing this wall isn’t a powerful new weapon, but the incredible feeling of pure mastery. After hours of failure, you finally win not because your character got stronger, but because you got better. You learned the patterns and conquered the challenge through sheer personal skill. But what happens when the difficulty isn’t about reflexes, but about an almost endless amount of patience?

The Endless Ocean: When ‘Hardest’ Just Means ‘Longest’

While some games test your reflexes, others test your calendar. This type of difficulty isn’t about a single impossible moment, but an intimidating marathon of time. It’s a challenge measured not in seconds, but in hundreds, or even thousands, of hours. Welcome to the world of the “grind,” where completing a game is less a feat of skill and more a monumental test of endurance.

At its core, grinding is the video game equivalent of searching an entire beach for one specific grain of sand. Players perform the same repetitive tasks over and over—defeating the same enemies, crafting the same items—for a very distant reward. This is especially common in Massively Multiplayer Online games (MMOs), vast digital worlds shared by millions of players, designed to be played for years.

Consider an achievement in a game like Final Fantasy XIV that rewards players with a unique flying mount. To earn it, you might need to accumulate a staggering 500,000 points in a specific activity. For a dedicated player, this task alone can take over 800 hours. That’s like watching every single episode of Game of Thrones ten times over, all for one digital prize.

This isn’t about being good at the game in the traditional sense; it’s about sheer, unwavering commitment. The challenge is fighting off burnout and dedicating a massive part of your life to a single virtual goal. But what happens when even hundreds of hours of your time aren’t enough to guarantee a win? What if success is left entirely to chance?

The Cosmic Lottery: Games Decided by Pure, Dumb Luck

Sometimes, no amount of skill or time can save you. You’re simply at the mercy of the game’s internal lottery. This kind of difficulty is driven by something gamers call RNG, or Random Number Generation. In simple terms, think of it as the game constantly rolling a digital die behind the scenes to decide what happens next—from the items you find in a treasure chest to the way an enemy attacks. It adds unpredictability, but when taken to an extreme, it can become a brutal wall of pure chance.

This randomness often appears in the form of a “drop rate,” which is the percentage chance that a defeated enemy will leave behind a specific item. In many role-playing games, a player might need one ultra-rare sword to complete their collection. The problem? That sword might have a 1-in-2,000 drop rate. This means that, on average, a player has to defeat that same enemy two thousand times just for a chance to get the item. It’s the video game equivalent of buying thousands of lottery tickets hoping for a single, specific winning number.

For many, this is the most maddening type of challenge. Skill can be learned and time can be invested, but you can’t outsmart bad luck. A game that locks a final achievement behind these astronomical odds can feel truly impossible, testing a player’s patience far more than their abilities. But what if the obstacle isn’t your reflexes, your time, or your luck, but your own mind?

The Brain-Breaker: When the Hardest Puzzle Is Figuring Out the Rules

Finally, there’s a type of difficulty that doesn’t test your fingers or your luck, but your mind. Imagine being handed a beautiful, intricate machine with no instruction manual. That’s the core of puzzle-based difficulty, where the first and greatest challenge is simply figuring out the rules. This is often called obtuse design, where a game intentionally hides how its world works. The challenge isn’t just solving a puzzle; it’s learning the language you need to even understand what the puzzle is asking.

A perfect modern example is the celebrated 2016 game The Witness. You are dropped on a mysterious island filled with thousands of grid-based line puzzles, with absolutely no text or tutorials. At first, it’s baffling. But as you explore, you begin to realize the island itself is the instruction manual. The shape of a tree’s branches might teach you the rule for one puzzle type; the reflection of a statue in the water might provide the solution for another. The game doesn’t give you answers—it teaches you how to think.

This mental marathon often pushes players to grab a real-world pen and paper, sketching maps, deciphering symbols, and taking notes as if they’re studying for an exam. Completing these games is less about execution and more about investigation. The triumph comes from a massive “Aha!” moment when a hidden rule finally clicks into place. This kind of demanding design might seem like a recent trend, but it raises a classic question: They don’t make them like they used to, but are old games really harder?

They Don’t Make Them Like They Used To: Are Old Games Really Harder?

That classic phrase, “they don’t make them like they used to,” holds a lot of weight in gaming. Older games, especially from the 80s and early 90s, have a reputation for being brutally difficult, and it’s not just nostalgia. This punishing design was often a holdover from the arcades, where the goal wasn’t just to entertain you but to get you to spend another quarter. Games were often very short, so to extend the experience, developers made them incredibly hard to master. When these titles came to home consoles, they brought that punishing philosophy with them.

Much of this old-school reputation comes down to two features we now take for granted: limited lives and a lack of checkpoints. In many older games, you started with just three lives. Lose them all, and it wasn’t a matter of restarting from a recent save point—it was Game Over, sending you right back to the title screen. Modern games are filled with checkpoints that save your progress every few minutes. The difference is like falling off a ladder and landing on the rung below versus falling all the way back to the ground every single time you slip.

For a masterclass in this brand of punishment, look no further than the notorious Ghosts ‘n Goblins. In this game, a single touch from an enemy strips away your armor, and a second sends you back to the start of the level. But the final, cruel twist is what makes it legendary: after beating the entire grueling journey, the game tells you it was all an illusion and forces you to play through the whole thing a second time on a harder difficulty to see the true ending. While this arcade-style cruelty has mostly faded, some modern games have simply found new mountains for players to climb.

The Ultimate Contender: A Game That Demands Skill, Time, AND Luck

While older games were tough, some modern games have created a new kind of challenge by making every playthrough completely unpredictable. This brings us to a genre known as roguelikes. Imagine trying to escape a maze where, every time you fail and have to restart, all the walls have been rearranged. That’s a roguelike: the levels, items, and enemies are randomly shuffled every single time you die, forcing you to constantly adapt.

Perhaps the most famous—and infamous—example is The Binding of Isaac. With its quirky, hand-drawn art style, it looks like a simple cartoon. But beneath the surface is a game of staggering complexity. Completing it doesn’t just mean beating the final boss once; it means doing it dozens of times under wildly different conditions to unlock hundreds of secrets and satisfy its true ending requirements.

To earn that coveted 100% completion status, a player must overcome a brutal combination of all three difficulty types:

• Skill: Beat the game with 34 different characters, each with unique, often punishing, abilities.
• Time: Unlock over 700 items and 600+ achievements, a task that often exceeds 1,000 hours.
• Luck (RNG): Hope the right items appear to create a winning combination, and pray that rare in-game events occur for certain achievements.

It’s this perfect storm—demanding elite skill, a colossal time investment, and sheer random luck—that makes The Binding of Isaac a top contender. Getting that final achievement isn’t just about being good; it’s about being good for hundreds of hours while waiting for the game’s digital dice to finally roll in your favor. But even with such a demanding challenge, is it the undisputed king?

So, What’s the Real Answer to the ‘Hardest Game’?

The question “What is the hardest game to fully complete?” doesn’t have a single answer, because “hard” means different things. The true landscape of digital mountains reveals that difficulty isn’t just about a final boss. Some challenges demand impossible skill, others a lifetime of patience, and a few require a staggering amount of luck.

Defining video game completionism depends on the specific challenge. The hardest test of pure reflexes might be Sekiro. The ultimate trial of patience could be the thousands of hours sunk into Final Fantasy XIV. And when a game demands mastery over all of these, plus a dose of incredible luck, a title like The Binding of Isaac stands apart.

Ultimately, the pursuit of these goals isn’t about bragging rights. It’s about the journey itself—a testament to human dedication against staggering odds. For the players who conquer these challenges, the reward is the quiet satisfaction of standing on a summit that most will never see, having conquered a world designed to be unconquerable.