How to Fight Sisyphus Prime

Facing Sisyphus Prime in Ultrakill is a true test of skill, precision, and mastery of the game’s fast-paced combat mechanics. As one of the most difficult bosses in the game, Sisyphus Prime doesn’t just test your aim but also your reaction time, movement, and decision-making under pressure. With his relentless attacks and rapid movement, many players find themselves overwhelmed during the fight. However, with the right strategies, loadout choices, and a solid understanding of his mechanics, you can overcome Sisyphus Prime and emerge victorious. This guide will break down the best methods on how to fight Sisyphus Prime effectively and consistently.

Understanding the Sisyphus Prime Fight

Sisyphus Prime is the final boss of the Prime Sanctum level in Ultrakill. As a Prime Soul, he’s designed to be extremely aggressive and punishing. Unlike many other bosses, Sisyphus Prime doesn’t allow you much breathing room, which makes learning his patterns and maintaining control essential.

Key Characteristics

• Extremely fast movement and teleportation
• Rapid combo-based melee attacks
• Long-range shockwaves and slam attacks
• Health-based phase transitions

Before fighting him, make sure you’re comfortable with all movement mechanics in Ultrakill including dashing, sliding, wall-jumping, and parrying. These will all be critical during the encounter.

Preparing for the Battle

Going into the Sisyphus Prime fight unprepared is a sure way to get defeated. Ensure that you have the optimal loadout, full health, and a strong understanding of how each weapon interacts with him. This boss doesn’t give many chances, so every tool in your arsenal counts.

Recommended Loadout

• Revolver: Marksman variant for coin toss ricochets
• Shotgun: Core Eject for heavy burst damage
• Nailgun: Overheat variant to sustain DPS
• Railcannon: Screwdriver or Malicious for burst sniping
• Rocket Launcher: Fire variant for heavy explosive damage

The coin toss mechanic of the Marksman revolver is especially effective during the short windows when Sisyphus Prime is stationary or stunned. The Overheat nailgun helps maintain damage while you focus on movement and dodging.

First Phase Strategies

In the first phase of the fight, Sisyphus Prime will primarily use close-range dash attacks and melee combos. He will sometimes slam the ground to create shockwaves or attempt a grab. This phase is less chaotic than the second, but still demands precise dodging and counterattacks.

Key Attacks to Watch For

• Dash Combo: A fast multi-hit sword attack. Dash away or parry the final hit.
• Ground Slam: Creates a shockwave that expands outward. Jump or dash above it.
• Grab: Telegraphs with a red glow. Dash backward quickly to avoid.

Tips for Phase One

• Use the environment to keep distance and avoid getting cornered.
• Parry when possible to stun him briefly and land high-damage combos.
• Use the nailgun to deal constant damage while evading.
• Combo your revolver coins and railgun to capitalize on moments of vulnerability.

Second Phase Changes

After losing around 50% of his health, Sisyphus Prime becomes more aggressive. He gains new attacks, moves faster, and his combos become longer and more unpredictable. This is where many players struggle if they don’t adapt quickly.

New Phase Two Attacks

• Lightning Barrage: Sends shockwaves rapidly across the field jump and dash to avoid.
• Teleport Slam: Disappears and reappears with an aerial slam keep moving.
• Rage Combo: Rapid slashes that can chain from across the arena.

During this phase, your survivability depends on recognizing the new animations quickly and staying mobile at all times. Aggressive play is still needed, but don’t tunnel vision damage output prioritize survival first.

Tips for Phase Two

• Keep your dashes off cooldown as much as possible. Don’t waste them on small repositioning.
• Stay mid-range close enough to punish, far enough to dodge in time.
• Save your railcannon for when he finishes a long combo, especially after his teleport slam.
• Use your shotgun eject only when he’s stunned or locked into an animation.

Using the Parry Effectively

Parrying is a powerful tool in Ultrakill, and it becomes even more valuable in the Sisyphus Prime fight. Parrying his melee attacks not only cancels his combo but also opens him up for counterattack. However, missing a parry leaves you vulnerable, so it must be timed carefully.

When to Parry

• The final hit of his basic sword combo
• Mid-air slashes that are clearly telegraphed
• After his ground slam when he briefly pauses

Practicing parries in earlier levels or with lesser enemies can prepare you for these clutch moments in the boss fight. If executed well, they can make the fight significantly easier by creating consistent openings.

Advanced Movement Techniques

To defeat Sisyphus Prime, you’ll need to move like a pro. Regular jumping and dashing won’t be enough once the fight hits its peak. Integrate wall jumps, slam storage, and slide-jump chaining to stay unpredictable and untouchable.

Effective Movement Patterns

• Slide-jump-dash: Helps break tracking and reposition
• Wall jumps: Use the arena walls for height advantages
• Slam canceling: Use a ground slam for downward control, then jump-cancel to reposition

Staying airborne is often safer than staying grounded. Many of Sisyphus Prime’s attacks are horizontal and can be dodged with good vertical movement. Keep changing direction and altitude constantly.

Maintaining Pressure and Momentum

Though the boss is dangerous, being too passive can also work against you. Letting him take control of the fight means more attacks to dodge and less opportunity to deal damage. Find moments to maintain pressure without compromising your safety.

How to Keep Pressure On

• Alternate between primary damage (nailgun, revolver) and burst (railgun, shotgun)
• Use coin shots when you’re mid-air or after dashing away
• Watch for his end-of-combo pauses and punish immediately

Eventually, with enough pressure, Sisyphus Prime will begin repeating patterns that you can learn and predict. Stay calm, and don’t panic during combo-heavy sequences focus on spacing and preparing your next shot.

Fighting Sisyphus Prime is one of the most intense challenges in Ultrakill, but with the right strategy, patience, and precision, he becomes beatable. Use optimal loadouts, master your movement, and stay aware of every attack he throws. Parry when it’s safe, pressure when there’s an opening, and never stop moving. Once you understand the flow of the fight, defeating Sisyphus Prime becomes not only possible, but incredibly rewarding. Keep practicing and refining your approach victory is within reach.