Headcount gives you one population target per day — say, 10,000,000 people — and one drawing. Trace a loop anywhere on a glowing world population map, lock it in, and the game counts the real number of people living inside your shape. Score 0–100 on how close you got.

1. One target a day. Targets rotate from city-sized numbers (500k) to whole-continent numbers (250M+), always clean, memorable figures.
2. Draw one loop. Any shape, any size, anywhere — ring a metro, hug a coastline, lasso an island chain. Drag inside your shape to move it, or redraw as often as you like before committing.
3. Commit blind. Your official attempt shows the enclosed area but never the live population — reading the dot map is the skill.
4. Then practice as much as you like. After your official lock, unlimited replays deal a fresh population target every round — submit each loop to reveal its population and score.

• Learn a few anchors.Greater Tokyo is ~37M, Cairo's metro ~22M, the Seoul capital region ~26M, greater London ~14M. One anchor city per continent turns guessing into interpolation.
• Brightness beats size. A tight loop around the Nile delta holds more people than a giant lasso across the Sahara. Density is the game.
• Use the area readout.The enclosed km² is always visible. Pair it with a density guess (a dense metro runs 2,000–10,000 people/km²) for a sanity check before you lock.
• Practice after committing.The live counter in practice mode is the fastest population-intuition trainer there is — tomorrow-you will thank today-you.