Relaymere: Logic Circuit Puzzle

A logic-circuit puzzle that teaches how computers think: wire switches, gates and lamps until the truth table lights up green, from NAND to adders, selectors and latches. 27 circuits with lessons and hints. Free download for Windows and Linux.

Relaymere is an educational puzzle game about digital logic. Switches sit on the left, lamps on the right, and a table says what every lamp must do. Place gates, run wires from outputs to inputs and press Test: every row of the table lights up green or red.

• 27 circuits in five chapters: lamps and switches, everything from NAND, counting with lamps (half and full adders, a 2-bit adder), choosing and comparing (selector, decoder, comparators) and memory (feedback, SR latch, data latch)
• Learn by building: a short lesson for every circuit and a hint button; the table checks your circuit live while you build
• Parts you build become parts you use: solve the half adder and it joins your parts box, then the full adder, the selector and the latch
• Stars for elegance: use the fewest parts (par is a proven reference solution)
• Free workbench with four switches, four lamps and a live truth table
• Mouse, touch, keyboard or controller; English and Bulgarian
• Native builds for Windows (64-bit) and Linux (64-bit); progress and settings are saved; no ads, no tracking, no internet needed.

Code and text written with AI assistance; checked by PN Scripts with automated tests. Every shape is drawn and every sound synthesised by code; there are no AI-generated image or audio files.

Controls

• Mouse: click a part in the box and then the board, drag between pins to wire, drag parts to move, right click removes
• Touch: tap a part, tap the board, tap one pin and then another to wire
• Keyboard: arrows move the cursor, Space or Enter picks and connects, Delete or V removes, X cancels, G flips a switch, T tests, Z undoes
• Controller: stick or D-pad moves, A picks and connects, X removes, B cancels, Y tests, LB undoes, RB flips a switch
• Esc, P or Start: pause

Made by PN Scripts.