Click the "New Game" button, then send the generated link to whichever friend(s) you want to play with. Once everyone joins, the person who created the game has to click "Start Game" for the game to begin. After the game starts, your goal is to score as many points as possible, which is calculated by how fast a player reveals tiles.
Tap reveal, long tap to flag
Left click to reveal, right click to flag
Your score is calculated by awarding 5 points per tile revealed, plus a time bonus. The time bonus is calculated with the formula (300 - secondsFromStart) * percentRevealed, however it will never drop below 0.