Tack Tack

Time your tacks, catch the gusts, stay out of dirty air, and don't break the racing rules.

Tack Tack is a one-tap upwind sailing race. Every tap is a tack, so the whole game is about when to tack.

TIME THE START The countdown runs 3, 2, 1. Tap before the gun and you get the black flag. Tap at GO and you're racing.

READ THE WIND Gusts roll down the course and make boats faster. Sail into them. Every boat blankets the air behind it, so stay out of other boats' wind shadow. The wind shifts, and so should you.

RACE BY THE RULES The racing rules are enforced live:

• Rule 10: port gives way to starboard
• Rule 13: don't tack too close to another boat
• Rule 20: give room to tack at an obstruction, including chains of boats passing the hail along Break a rule and you're disqualified.

SIX DIFFICULTY LEVELS From Beginner to Master. The AI picks its tacks, reads the wind shifts and follows the rules, including forced tacks under Rule 20.

MAKE IT YOURS Choose 2 to 10 boats, adjust the wind speed, and turn the sound on or off.

Simple to learn, hard to master. Built by a sailor.