🚀 Community Speedrun & Physics Glitches Guide

While the developers intended Human: Fall Flat to be a slow-paced puzzle platformer, the game’s wobbly physics engine holds secrets that speedrunners have exploited for years. By exploiting collision math, frame-rate physics ticks, and arm stretch limits, you can fly across maps and climb infinite vertical walls.

This guide details the top four community techniques used to break the game’s boundaries.

📸 Glitched Climb: Defying gravity by exploiting Bob's arm-rotation friction physics.

🧗 1. Vertical Flap / Paddling (左右划水爬墙法)

• Difficulty: ⭐⭐⭐⭐☆
• Purpose: Climb completely smooth, flat vertical walls to infinite heights.
• Theory: When Bob grabs a wall and rotates his camera, the shoulder joint stretches. By alternating left and right grabs while rotating the camera rapidly, you bypass the vertical limit.
• Step-by-Step Execution:
  1. Stand facing the wall. Raise both hands and jump to grab as high as you can.
  2. Release your Right Hand only.
  3. Quickly flick your mouse to the right (about 45–60 degrees). This rotates Bob’s hips and shoulder, raising his free right arm higher up the wall.
  4. Grab the wall with your Right Hand at this new height.
  5. Release your Left Hand. Flick your mouse to the left.
  6. Grab the wall with your Left Hand at the new height.
  7. Repeat this rhythm: Release Right -> Turn Right -> Grab Right -> Release Left -> Turn Left -> Grab Left. It will look like Bob is “paddling” or “flapping” up the wall.

🪂 2. Single-Hand Super Swing (单手极限摆荡)

• Difficulty: ⭐⭐⭐☆☆
• Purpose: Swing across massive gaps using a single anchor point, gaining double the normal momentum.
• Theory: Grabbing with both hands distributes weight evenly but limits swing range. Grabbing with only one hand allows Bob to act as an offset pendulum, creating torque.
• Step-by-Step Execution:
  1. Jump toward the swing rope, pipe, or ring, and grab it with only one hand (e.g., Left Hand).
  2. Hold down the forward movement key (W) as you swing forward.
  3. When you reach the peak of the forward swing, do not release. Instead, turn your camera 90 degrees away from the swing direction and press A or D to slide Bob’s body around the rope.
  4. Swing back, and then swing forward again. On the second forward swing, press the keys to twist Bob’s body.
  5. The twisting motion adds rotational velocity. Release the grab at the peak of the second swing to propel yourself twice as far as a normal two-handed swing.

🏹 3. Slingshot Glide / Zipline Inertia (吊索势能惯性弹射)

• Difficulty: ⭐⭐⭐⭐⭐
• Purpose: Launch yourself across the map when releasing from ziplines, cables, or swinging chains.
• Theory: If you release a grab while Bob’s body is stretched to its limit, the physics engine releases the elastic tension instantly. This converts hook tension into pure forward velocity.
• Step-by-Step Execution:
  1. Grab a zipline handle or rope.
  2. Slide down to gain speed. As you near the end of the line, hold back (S) to pull your body behind the hook, stretching Bob’s arms.
  3. Suddenly release S and press W. Bob’s body will snap forward like a rubber band.
  4. Release the mouse clicks at the exact microsecond Bob’s body passes directly under the hook.
  5. If timed correctly, the velocity will double, gliding you hundreds of meters in the air.

🖥️ 4. FPS Checkpoint Skip (帧率调节逃课)

• Difficulty: ⭐⭐⭐☆☆
• Purpose: Force Bob to glitch through solid metal gates or skip checkpoint triggers.
• Theory: Human: Fall Flat calculates collision detection based on frame rate. At extremely high or low frame rates, the physics engine’s tick rate changes, allowing Bob’s wobbly limbs to clip through solid meshes when squeezed.
• Step-by-Step Execution:
  1. Go to a door or gate with a small gap (like the iron gates in Castle or Dark).
  2. Squeeze Bob’s body sideways into the corner where the gate hinges meet the wall.
  3. Grab the wall inside the gap with both hands and pull hard.
  4. FPS Manipulation: Speedrunners use keybinds or settings to temporarily cap their FPS to 15 (creates physics lag) or unlock it to 300+ (creates high-frequency collision updates).
  5. Wiggle your camera left and right rapidly. The collision solver will fail to calculate Bob’s boundaries in time, popping you straight through to the other side of the gate.

📊 Speedrun Glitch Matrix

Want to apply these glitches? Read our Mansion Walkthrough or choose a level from the Level Guides Index to find skips!