Connect The Dots 2D

Connect The Dots 2D is a colour-line puzzle of the kind where every cell must end up covered. Each board has dots in several colours, set out in pairs. You join each dot to its partner of the same colour with a line, and you keep going until every pair is joined and the grid is filled with lines.

The size of the grid sets the difficulty. The smallest boards are 5x5 and the largest 10x10, with more dots and more colours on the bigger ones. The developer lists over 900 puzzles, grouped into modes from beginner up to difficult, and says they are all available from the start rather than locked. There is no time limit and no cap on moves. Hints are available for hard levels, and finishing levels earns more of them. The frame is portrait, and the developer names mouse or keyboard as the inputs.

Pick a coloured dot and draw a line from it to the other dot of the same colour. Do this for every colour on the board. The level is solved when all pairs are connected and the lines between them fill the entire grid. Choose a mode that suits you, from beginner to difficult, and use a hint if a board defeats you.

Because the board has to be filled, a correct set of lines that leaves empty cells is not a solution yet. Lines can be longer than they first need to be to soak up spare space. Hints are earned by finishing levels, so clear a few easier boards before spending them on a 10x10.

A dot-pairing line puzzle on square grids. Portrait frame (600 by 960). Mouse or keyboard, per the developer, without further detail. Over 900 puzzles from 5x5 to 10x10, no timer and no move limit.

Flow Laser Quest also has you join each pair of same-coloured points without crossing an earlier path, and Ball Connect links matching balls through a grid where room runs short.