Gravity Core

Gravity Core is a 5-minute, single-screen survival game built for portrait phones. You move with a virtual stick and your core fires on its own — the real decision is where and when you detonate.

Hold the right-hand button to lock a gravity centre two body-lengths toward the nearest cluster of enemies (it falls back to your facing direction when nothing is alive). Enemies inside its radius are dragged inward. Release to detonate — the blast kills what the pull gathered, and the shock then chains outward from the crater, hopping up to two more times. Hold past 1.2 seconds and it fires without you. Every shot costs a 4-second cooldown, so the pull is a commitment.

• One arena, three enemy types (chaser → dasher → shooter), six upgrades, three difficulty presets.
• Every run has a code. Enter the same code and play the same way to reproduce the same run.
• Fully offline. A single HTML file: no account, no ads, no analytics, no network requests, no data leaves the device.
• Bilingual out of the box — English by default, with an in-game switch to 中文 (Chinese). Your language choice is remembered on this device.

How to play

• Move — drag anywhere on the left half of the field, or the on-screen stick. Your core attacks the nearest enemy automatically, every 0.7 s.
• Pull & detonate — hold the big right-hand button. The core locks two body-lengths toward the nearest cluster of enemies; it stops chasing once locked, so keep moving while it charges. Release to blast, then watch the shock chain outward from the crater. Slide up into the cancel strip to abort (no blast, cooldown still starts).
• Survive 300 seconds. Three hearts, 0.8 s of invulnerability after each hit. The fight pauses for an upgrade at 60 / 150 / 240 seconds.

On desktop: WASD or arrow keys to move, hold Space to pull and release to detonate, X to cancel, P or Esc to pause.

What this is

Five minutes, one arena, three enemy types, six upgrades — a complete run with no grinding and no unlocks. Jump in, play a run, chase your local best.

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引力核心 是一款 5 分钟、单屏幕的竖屏生存游戏。左半屏滑动移动，核心自动攻击最近的敌人；真正的决策只有一个——在哪里、什么时候松手。

按住右侧大按钮，会在朝最近敌群的方向两个身位处锁定一个引力中心（附近没有存活敌人时退回面朝方向）；范围内的敌人被向内拖拽，松手引爆——爆炸清掉被聚拢进来的敌人，冲击再从爆心向外连锁最多两跳。按住超过 1.2 秒会自动引爆，每次引爆后有 4 秒冷却，所以「聚拢」本身就是一次承诺。

一个场地、三类敌人（追击者 → 冲刺者 → 射击者）、六种升级、三档难度。每局都有一个开局编号：填同一个编号、用同样的操作，就能完整重现那一局。完全离线，打开即玩——无账号、无广告、无追踪，不收集任何数据。支持中英文，游戏内一键切换，语言选择自动记住。

操作：左半屏滑动移动；右侧按住聚拢、松开引爆；向上滑入取消区则不引爆（仍进冷却）。撑过 300 秒，3 格生命，受击后 0.8 秒无敌，60 / 150 / 240 秒暂停三选一升级。桌面端用 WASD / 方向键移动，空格聚拢与引爆，X 取消，P / Esc 暂停。

这游戏是什么

一局五分钟：一个场地、三类敌人、六种升级。没有局外养成，也没有任何解锁——打开就玩，每局都在刷新自己的记录。