Your taps come out as misses — or worse, you hold A and D together and only one of them registers. The 30-second diagnosis: this is usually your keyboard's rollover limit, not the game. In Falsus is a 6-key rhythm game, and cheap membrane keyboards physically cannot register many simultaneous presses. Here's how to confirm it and every fix that works.
Why keys stop registering in a 6K rhythm game
Two Steam threads nail the problem. In "keys not registering?", a player found that hold notes on A and D would not register together — holding one made the other go dark. Replies pointed to keyboard ghosting and to SOCD settings on their keyboard. In another thread, a laptop player simply cannot press all six keys at once when FBD charts demand it.
The default layout — Left Shift, A, S, D, F, Space — puts six lanes under one hand. Membrane keyboards use a shared circuit matrix, and pressing certain key combinations makes others invisible to the PC ("ghosting"). Anything above 2–3 simultaneous keys is a gamble on office keyboards and most laptop keyboards.
Fix 1: Test your keyboard's rollover
Before changing anything, confirm the hardware limit:
- Open an online keyboard ghosting/rollover test (search "keyboard ghosting test")
- Hold your six game keys — LShift + A + S + D + F + Space by default — and watch which ones register
- Also test the specific pairs that fail in-game (e.g., A + D together)
If keys drop out on the test, the game is innocent — your keyboard can't send those presses, and no setting will change that.
Fix 2: Disable SOCD / Snap Tap (hall-effect keyboards)
This one is the opposite problem: a feature eating your inputs. Many modern hall-effect keyboards (Wooting, Razer, and similar) ship SOCD cleaning or "Snap Tap", which forces opposing keys like A and D to cancel or override each other — useful in shooters, fatal in a rhythm game that wants both held at once. The Steam thread's replies pointed exactly here.
Open your keyboard's software (Wootility, Razer Synapse, etc.) and turn off SOCD / Snap Tap / last-input-priority for the keys you use.
Fix 3: Rebind to keys that roll over together
Every Floor lane is rebindable in settings. If your keyboard ghosts on the default cluster:
- Choose six keys that your rollover test (Fix 1) shows registering together — often keys spread across different matrix groups, e.g. mixing rows
- Keep the one-hand layout in mind; the controls guide explains the lane logic and common rebinds
- Steam community members with ergonomic/split keyboards have posted full alternative layouts on the discussion board — worth a look if your keyboard is unusual
If no six-key combination on your keyboard registers cleanly, that's the hardware wall: a mechanical keyboard with n-key rollover (NKRO) is the real fix. It doesn't need to be expensive — NKRO is standard on most mechanical boards.
Fix 4: USB port, polling, and keyboard software
- Plug the keyboard into a rear motherboard USB port, not a hub or front panel
- If your keyboard software offers a 1000 Hz polling rate, enable it
- Close macro layers, lighting suites, and "game mode" remappers from other vendors — stacked remapping layers drop inputs
Fix 5: IME interference (Chinese / Japanese input)
If you use a Chinese or Japanese IME, it may be silently eating keystrokes — the IME intercepts keys for composition before the game ever sees them. Symptoms look exactly like "keys randomly not registering":
- Press Win + Space and switch to the English input method before launching the game
- Or disable the IME's activation hotkeys while playing
Fix 6: Steam Input conflicts
In Falsus has no controller support, but Steam Input can still sit between your keyboard and the game if a controller config is active:
- Steam library → right-click In Falsus Demo → Properties → Controller
- Set to Disable Steam Input
- Relaunch and test
Best keybinds for In Falsus
The defaults work, but most players rebind within the first hour — LShift under the pinky and Space under the thumb cramp fast. Full lane logic, note types, and rebind strategy: controls guide. The short version: pick six adjacent keys your keyboard rollover-tests clean, keep your hand in typing position, and don't fight the defaults out of loyalty.
FAQ
Why are my keys not registering? Usually ghosting — a hardware rollover limit on membrane keyboards, exposed by a 6-key rhythm game. Test it, then rebind or upgrade.
Two keys at once fail — what is that? Ghosting, or SOCD/Snap Tap on hall-effect keyboards cancelling opposing keys. Steam replies pointed to both.
Do I need a special keyboard? One with n-key rollover if you play ULT/FBD. Any mainstream mechanical board qualifies; laptop keyboards often don't.
Keys register but the game won't start? See demo won't launch and black screen fixes. Screen purple? Purple screen bug. No audio? No sound fixes. Then improve: beginner tips and rhythm strategy.
In Falsus © lowiro. This is an unofficial community guide based on the public demo and Steam discussion reports.