Logic Islands

Logic Islands takes its rules from Nurikabe. Every cell on the grid ends up as either island or wall, and the aim is to form islands that match their numbers exactly while keeping all the walls connected to one another.

The puzzles are spread across six worlds, and each world plays by its own ruleset. The first is classic Nurikabe. Later ones bring in further mechanics: the developer mentions Yin-Yang connectivity, ice blocks, one-way arrows and special orbs, without spelling out how each one works, so expect the rules to change as you move between worlds. There are 240 puzzles in total, which the developer says were picked by hand.

You mark cells by toggling them. A fill command covers connected areas in one go, there are separate draw modes to switch between, and undo and restart keys are on hand for when a deduction goes wrong.

On a computer, click a cell to toggle it between island and wall. Double-click or Ctrl-click to fill a connected area, and use the mouse wheel or Space to switch draw modes. Press Z to undo and R to restart. On mobile, tap to toggle a cell and double-tap to fill an area.

Under the classic rules, every island has to match its number exactly, so an island that has reached its count can be closed off with wall around it. The walls must stay joined, which rules out any wall cell that would end up cut off. Z undoes a step, so a doubtful guess can be tested and taken back.

A Nurikabe-style logic puzzle with 240 puzzles over six worlds, each with different rules. The frame is portrait. Controls are listed for PC (mouse, plus Z, R and Space on the keyboard) and for mobile (tap and double-tap).

Minesweeper Infinite is also a grid of numbers to reason from, in Classic or Endless form. Logic Pro - Neon Edition is a lights-out puzzle: switch every tile off, knowing each press flips its neighbours.