A circuit-wiring puzzle. You switch wires on and off in a small network so the light bulb receives exactly a target amount of power. Too little and it stays dim; too much and it overloads. One wrong answer ends the streak.

How does the power reach the bulb?

Power flows from the battery through every part connected to it. Cells with a plus add power, drains with a minus subtract it, and junctions just pass it along. The bulb lights only when it is wired back to the battery, and it shows the combined power of everything in that connected network.

Why does the bulb sometimes overload?

The bulb wants the target value exactly. If the parts you have wired together add up to more than the target, the bulb is overloaded · switch some wires off, or route around an extra cell, until the total lands on the target.

Arithmetic is part of it, but the real challenge is connectivity. Every part you connect joins the same network, so you have to choose a path that reaches the bulb while including the right cells and excluding the rest · a stray wire can pull in an extra cell and tip you over.

Yes. Easy starts on a tiny three-by-three board; each round you clear grows the board, adds more cells and larger targets, and introduces drains you have to balance against the cells.

How does my progress save?

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Power Grid · Русский

Toggle the wires so the bulb receives exactly the target power, then light it. JavaScript required.

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