Voltage Bet

Every board is a dead circuit, and one live spark sits at the battery socket waiting for somewhere to go. You swipe, and the current shoots off in a straight line, energising every cell it crosses, and it does not stop until it meets a wall, a chip or the trail it has already burned. That last part is what turns a simple gesture into a puzzle you have to think several moves ahead about.
The goal is plain and unforgiving: light every free cell on the board. Strand the spark in a corner with cells still dark and the whole thing browns out. Undo steps back one move, reset starts the board again from the socket, and a board finished without touching undo is recorded as a clean run. The move counter sits at the top the entire time, quietly counting everything you spend.
Four packs, six boards each, growing from small warm-ups to eight-by-eight grids crowded with chips. Breadboard is where you learn how current stretches. Relay Row lets the chips crowd the traces, and Coil Yard and Mainframe stay shut until you have lit enough of what came before. Every board is guaranteed to have a solution, which means every failure belongs to you rather than to the board.
Alongside them sit twelve true things about the force in the wires. That current takes every path open to it but overwhelmingly favours the easiest one. That a fuse is a wire built to be the weakest link on purpose. That the zap from a winter doorknob can exceed ten thousand volts and still only sting. Three quiz formats turn the reading back into questions, and the glowing traces stop feeling like decoration.