Chalk Line

Chalk Line is a calm, clever one-thumb drawing-puzzle game set on a classroom slate board. Every lesson is a single physics puzzle: a chalk ball waits near the top of the board and a chalk-drawn bowl sits somewhere below it. Between them are pink chalk spikes and blue chalk walls. Your job is to draw the chalk line that carries the ball safely home.

Press and drag one finger to draw a single chalk stroke anywhere on the slate. The moment you lift your finger, that line hardens into a solid rail -- the ball rolls off under gravity and bounces along whatever you drew. Shape a gentle slope, a swooping curve or a little jump to steer the ball past the marks and land it cleanly in the bowl.

There is a catch: every lesson gives you a limited stick of chalk, shown in the dust meter, so you cannot just scribble your way across. The shorter and smarter your line, the higher your mark -- leftover chalk turns into bonus points, and a clean low-chalk clear counts as a perfect. Pink spikes end the roll the instant the ball touches them, while blue walls are solid and bounce the ball off, so read the board and plan your stroke before you commit. Curve your line through the yellow chalk gems along the way for extra marks.

Work through ten hand-drawn lessons that tighten the chalk budget and stack more spikes, walls and offset bowls the deeper you go, and chase a better mark on every one. It is a slow, satisfying think-then-draw loop -- part chalkboard, part physics toy.

Features:
- One-finger chalk drawing -- draw a line, let go, and watch it roll
- Real physics: gravity, rolling, bouncing and collisions off your own line
- 10 hand-tuned lessons that unlock one at a time, each trickier than the last
- A limited chalk budget that rewards short, clever strokes with bonus marks
- Pink spikes to dodge, blue walls to bounce off, and yellow gems to collect
- A per-lesson best-mark report card and a clear built-in rules guide
- Fully offline: no ads, no sign-in, no internet, no accounts

Quick to pick up, easy to lose an evening to -- draw one chalk line, roll the ball, and land the perfect run.