โ๏ธ Physics & How it Works
Realistic physics: The game uses physics close to real curling: ice friction, curl, and sweeping effects.
๐ฏ Throw
You set speed (slider) and spin (left/right). A slow shot travels about 22โ26 m, a fast one up to 45 m. Spin makes the stone curl as it slows down.
๐ง Friction & Slowing
The stone slows down due to ice friction. When it is very slow (< 0.6 m/s), friction increases so it stops in a realistic distance (e.g. 22โ26 m for a draw).
If v < 0.6: a ร 1.8
With sweep: a ร (1 โ 0.22ยทp), p = sweep power (max 22% reduction)
๐งน Sweeping
Sweeping reduces friction (stone goes further) and uses up curl (spin potential). You can sweep left, straight, or right. Only the thrown stone can be swept, and only until the first collision.
Curl: only correct-side sweep reduces spin potential; wrong side = no effect
No lateral nudge (realistic)
โ ๏ธ Wrong-direction sweeping
Sweeping the side that doesn't match the curl gives a steering nudge in the wrong direction, so the path gets worse. To reduce right curl you should sweep on the right (nudge corrects the path); sweeping left adds a left nudge and doesn't fix the right curl.
โ๏ธ Straight sweep on a right-curling stone
If the stone is curling right and you sweep straight: friction is reduced (more distance) and spin potential is consumed evenly, but no left/right steering is applied. The stone keeps curving right with the remaining spin until it's used upโso straight sweep helps length, not direction.
๐ Curl
The stone curves sideways as it slows (spin potential). Sweeping on the correct side reduces this curl. The stone does not gain extra curl from sweeping.
S = spin potential, perpendicular to velocity
Curl is strongest when v is low
๐ฅ Collisions
When stones hit, momentum is shared (similar mass). A headโon hit stops the thrown stone and moves the other. Stones that leave the sheet are disqualified.
Same mass โ velocities exchange in 1D headโon
๐ In short
Speed and spin set the path; sweeping lets you extend distance and reduce curl. Physics and field size are close to real curling so the game feels realistic.
๐ฎ How to Play
๐ฅ What is curling?
Curling is a team sport played on ice by sliding stones toward a target (the house). Stones closer to the centre than the opponent's score points.
๐ฏ Where do you set speed and direction?
On your turn, the throw area at the bottom has a speed slider and left/right spin buttons. Choose speed and curl direction, then release. After the throw you can sweep to influence the stone's path.
๐งน Where and how do you sweep?
While the stone is moving, the sweep control (circular or direction buttons) appears on screen. Only your thrown stone can be swept, and only until the first collision. Sweep left, right, or straight to affect both distance and curl.
๐ฏ How do you score?
At the end of each end, each of your stones closer to the centre than any opponent stone scores 1 point. You can hit opponent stones out or draw your own closer. The team with the closest stone wins the end and is the only one that scores.
๐ In short
Set speed and spin to throw; use sweeping to adjust distance and curl. Hit opponent stones or draw yours closerโwhoever has the closest stones in the house scores.