🔌 Power Grid Rescue — a free maths game for kids
The city is dark. Build exact amounts of power from hundreds, tens and ones and switch the lights back on.
42 is four tens and two ones, and that fact is far more convincing when four ten-batteries and two one-cells are what turned the hospital lights on. Later missions ask for what remains after a draw, then move into hundreds, then into decimal megawatts, so place value grows without ever changing the mechanic.
How to play
- 1Pick a dark building on the city map and read how much power it needs.
- 2Add hundred-unit reactors, ten-unit batteries and one-unit cells until your total matches exactly.
- 3Tap a placed unit to take it back off the line.
- 4Hit the switch. The building lights up — and stays lit on your city map.
Frequently asked questions
- What is place value and how does this teach it?
- Place value is the idea that a digit's position sets its size — the 4 in 42 means four tens. The game makes the tens physical: children stack ten-unit batteries and one-unit cells until the total matches, so the structure of the number is something they build rather than recite.
- Does it cover decimals?
- Yes. From Grade 4 the reactors produce fractional megawatts, so children combine values like 4.75 and 2.35 to hit a target exactly.
- What happens to buildings I have powered?
- They stay lit. The city map remembers every building restored on that device, which is the long-term reason to come back.
- Is it free?
- Yes — free, no signup, works on any browser.