Press space or click Next step — one click reveals exactly one step.
← back · R replay · V narration · M effects ·
B music · F full screen.
P — or the ▶▶ button — plays the rest of the solution by itself,
a step every 0.3 seconds. Touch anything and it hands back at once; it always stops
on the answer and never leaves the question. The speed is set below.
Difficulty is two separate things. Grade is the level — and when a paper
declares its own, that wins: this one says Primary 1 on the cover, so every
question here is G1. Stars are the insight needed on top, which is where all
the difficulty actually lives. A 4-star Primary 1 question can beat an adult.
Every problem is its own record in problems/; this page is only an index over them.
Pick the background music below. The choice sticks for every question, and the
🎵 button on a question turns it on and off.
Your report card
What you have tried, how hard it was, and — where you picked a wrong answer —
which mistake it was. That last column is the useful one.
Reported problems
Anything flagged with ⚑ Something looks wrong on a question lands here. It stays on
this device — nothing is sent anywhere.
Playing a solution by itself
On a question, ▶▶ (or the P key) walks the rest of the solution without
being pressed. The narrator and the sound effects stand down while it runs, it stops on
the answer, and touching anything hands it straight back. Pick the pace here.
Music
Pick the theme here and it applies to every question. Press ▶ Listen to try one.