Game Controls

A complete reference for how to interact with Asteroid Field — from revealing and flagging sectors to switching difficulty, adjusting settings, and navigating the field on mobile and web.

Touch & Mobile Controls

Input	Action
Tap an unrevealed sector	Reveal the sector (scan it)
Long-press an unrevealed sector	Place or remove a flag
Tap a flagged sector	No effect — must long-press to remove flag first

Web & Desktop Controls

Input	Action
Left-click	Reveal the sector
Right-click	Place or remove a flag
Left-click on a flagged sector	No effect — must right-click to remove flag first

On-Screen Controls

Restart

Start a new game at the current difficulty. The board is regenerated — asteroid positions are randomized on the first click of the new game.

Difficulty selector

Switch between Beginner, Intermediate, and Expert. Changing difficulty immediately starts a new game at the selected level.

Settings

Open the settings panel to change the cell cover style and toggle first-click safety. Settings are saved between sessions.

Difficulty Levels

Difficulty	Grid	Asteroids	Density
Beginner	9×9	10	12%
Intermediate	16×16	40	16%
Expert	16×30	99	21%

Beginner — A compact grid with low mine density. Ideal for learning the mechanics — most fields resolve with basic counting alone and rarely require advanced deduction.

Intermediate — A larger grid with higher density. Requires confident use of both flag-based counting and number-subtraction to progress. Expect longer reasoning chains.

Expert — The full challenge. High density on a wide board creates frequent constraint intersections and occasional forced guesses at the boundary of what pure deduction can resolve.

Settings

First Click Safety

When enabled, the asteroid layout is generated after your first tap so the clicked sector and its 3×3 neighbors are always clear. Enabled by default. Disabling it allows asteroids to be placed anywhere, including under your first click.

Cell Cover Style

Choose between Box and Shield visual styles for unrevealed sectors. Both are purely cosmetic — gameplay is identical regardless of the selected style.