🎮 Two Indices, Not One

📖 About this game

A game on the lesson of indexing nested lists. Its rule: a nested list is a list whose elements are lists, so the first index picks the inner list and the second picks an element inside it. Why the learner touches a cell in a grid rather than choosing from a row of buttons: a nested list is in truth a grid of rows and columns, and touching the cell reads both indices at once in a single step. The two indices are never equal in any round, because a learner who swapped their order would then land on the very same cell and the mistake would pass unseen, and swapping is the expected mistake of this lesson so it must land elsewhere to be measured. The answer is computed from the two indices rather than typed by hand, and the reveal shows the whole inner list first and then the element taken from it, so the learner sees the two steps apart. Ten rounds. No sign-up.

🕹️ How to play

1. Read the nested list: every row is an inner list.
2. The first index picks the row, the second picks an element in it.
3. Touch the cell you reached.
4. Every line you get first try counts for you.