一瞬：空手奪白刃

Issen: Catch the Blade Bare-Handed

一瞬：空手奪白刃

A one-button reaction game in an ink-wash painting style. The instant your opponent's blade flashes, press Space / Enter or tap the screen to catch it bare-handed. Your reaction speed decides the result: Divine (神), Excellent (妙) or a narrow Risky (險) dodge. Too slow or too early, and you take the hit.

Nine swordmasters each have their own tells and feints: the quiet click of a sword guard before an iaido master's draw, a dual-blade fighter's combo strikes amid lightning flashes that fake the blade's glint, an archer's timing lane, a giant's charged heavy blow, and more. Challenge the eight outer masters in any order; defeat them all and the Sword Saint appears at the center for the final trial.

Language: the in-game text is in Traditional Chinese only. Everything you need is a single button — watch for the flash.

FEATURES

- Nine bosses, each with unique tells, feints and techniques — challenge them in any order

- Qi, stances, and the rare one-strike "Isshun" (一瞬) finisher, with manga-style close-up cuts

- Endless mode (百人斬), practice mode (修行), an easier Kid mode (童子) with wider timing, an advanced high/low stance mode (上下段), latency calibration (校準) and achievement seals (印譜)

- Ink-wash result cards you can share — on clearing the game, at the end of an endless run, or on your first Isshun

- A single HTML file that plays straight in the browser on desktop and mobile — no install, no account

CONTROLS

- Strike: Space / Enter, or click / tap the screen

- Heavy strike: when "重" (Heavy) appears, hold; release the instant "放" (Release) appears

- High/low stance (advanced mode): ↑ / ↓, or press and swipe up / down

- When Qi is full: 1 = Instant Kill, 2 = Heal, 3 = Hold (or tap a button)

- Pause: Esc or P, or the pause button at the bottom-left, next to 收手 (Quit). Pressed mid-strike, it pauses after the round ends.

Timing: Divine ≤ 180 ms, Excellent ≤ 300 ms, Risky ≤ 400 ms. Kid mode widens the windows; each boss adjusts them by up to about ±15% — the iaido master, dual-blade fighter and Sword Saint are stricter.

Tips:

- If keys don't respond, click the game once to give it focus.

- Bluetooth audio lags — trust the flash, or use Calibration (校準) in the menu.

- Sound starts after your first click or tap.

AI DISCLOSURE

Sound effects, music and voices in this game are AI-generated assets, created with ElevenLabs and used under a commercial license in accordance with ElevenLabs' Terms of Service. AI-assisted tools were used in developing the code and text.

CREDITS & LICENSE

© 2026 IssenStudio. All rights reserved. Except for the assets listed below (each under its own license), the game's code, visuals, text and presentation are copyright IssenStudio. No reproduction, distribution, modification or republishing of all or part of this game is permitted without authorization.

- Title font: Liu Jian Mao Cao ("一") and Ma Shan Zheng ("瞬"), SIL Open Font License 1.1 (Copyright 2018 The Liu Jian Mao Cao Project Authors / The MaShanZheng Project Authors)

- Instrument samples: FluidR3 SoundFont (Copyright © 2000–2002, 2008, 2013 Frank Wen, MIT License), converted via soundfont-for-samplers (MIT License)

- 3D rendering: Three.js (Copyright © 2010–2021 three.js authors, MIT License)

- Animation: GSAP (Copyright 2024 GreenSock, GreenSock Standard License)

- Sound effects, music and voices: AI-generated assets (commercial license)

PRIVACY

No sign-up, no personal data, no cookies, trackers, ads or analytics, and no camera, microphone or location permissions. Your progress, in-game name, seals, records and settings are stored only in your browser on this device (under the itch.io domain when played here) and are never uploaded. "Share results" (分享戰績) creates an image on your device that includes your in-game name — please don't use your real name. The image only leaves your device when you tap Share (分享圖片) or Download (下載圖片). The game loads Three.js and GSAP from cdnjs, and itch.io may log ordinary connection information under its own privacy policy. Full details: 隱私權 (Privacy) at the bottom of the in-game menu.