GEOMETRY: MASTERED.

But her worksheet was different.

The music stuttered, then warped into a low, humming drone. The background—a starry sky—began to pixelate, then reform. The yellow smiley face on her icon… blinked. Not a programmed blink, but a real one. A slow, confused blink.

Lena looked at the reflection puzzle. Then she remembered her worksheet. The diagram she’d ignored. A reflection across the Y-axis changes the sign of the X-coordinate.

She spun just as the sawblade whizzed past her former position. Her heart hammered against her pixelated chest.

She was halfway through the level, approaching a tricky series of rotating blocks, when the screen flickered.

Text flashed on the screen in jagged, glitchy letters:

A triangle appeared. It was labeled A , B , C .