Read me

Plain English, for anyone who needs the idea before the design pages.

What we are building

One playable slice of a Class 10 science game. The chapter is Electricity. This slice does not teach the whole chapter. It teaches the opening ideas: a closed circuit, what current is, how an ammeter is used, charge and time, electrons in a metal wire, and why the usual current arrow points the opposite way from the electrons.

It is a game, not a worksheet with pictures. The student handles toy parts. The village is the reason to bother.

The game, simply

The village is dark. You are Wonder or Arav. Professor Ohm asks you to make one light work.
You pick up a cell, a bulb, a switch, and wires. You plug them together and press a lever. If the loop is open, the bulb stays dark. If it is closed, it glows.
You look inside the wire with a lens. Tiny electrons are moving. You can poke one. It is a model, not a real microscope. If you want a break, you can steer Amp between them. A few hits and he overcharges and the round ends. That game is optional. The lesson does not need it, and overcharge is not a science fact.
You snap a meter into the loop and slide a marker to the tick the needle points at. That number is the current.
You turn a dial and a clock, guess how much charge will collect, and watch a jar fill. The jar is a picture of charge, not a school instrument. Then you try it with a different unknown.
You set two dials for how many electrons that charge means. About 6 × 10¹⁸ in one coulomb. You do not click the “right” electron.
Two arrows disagree. You twist them, pin three cards, and snap a short sentence. Conventional current goes the other way from the electrons.
Out on the street, one lamp has a loose plug. You fix it with the same moves. One lamp comes on. The clinic and the pump stay dark.
A short cutscene. Ohm asks what is pushing the flow. There is no puzzle and no answer yet. You can skip it.

If you get something wrong, the object shows it. A hint comes next. A plain explanation comes after that. You still have to do the move yourself. Playing with the parts is never punished.

When it is accepted

The slice is accepted when a student can do the science with their hands, and the build matches these checks:

An open switch or a loose plug leaves the bulb dark. Closing the loop lights it.
Turning the cell around does not, by itself, keep a good loop dark.
A meter clipped the wrong way gives a useless reading. It does not explode.
The student can read a tick on the meter without pixel-perfect aiming.
They can predict charge, current, or time, including one unit change, after seeing the jar fill.
One coulomb is accepted as about 6 × 10¹⁸ electrons. Missing 6.25 is not a fail.
They can place the two arrows opposite each other and say why.
One street lamp can be fixed. The rest of the village stays dark.
The ending cutscene can be skipped. It does not teach voltage.
Coins and badges do not block any of the science.
Picking things up and putting them down does not count as a mistake.

This site is the final PRD for Mission 1. Electron Dodger is the only optional piece. Everything else on this page is core.