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Three of them, and they are not the same game three times. One is about the ball, one is about the spare, one is about the arithmetic. All free, all in the browser.
The first two share a lane model: a 41.5 inch lane, sixty feet of it, oiled for roughly the first thirty-six. On the oil the ball skids and holds its line; past it the surface grips and the ball's rotation finally turns it. More revs means more hook, more speed means less, and the two have to be matched rather than maximised.
That is the same relationship the rev rate and ball speed calculators describe in numbers. Playing with it is faster than reading about it.
Axis tilt, coverstock chemistry, core dynamics, and the way a lane transitions as oil moves during a session. Also the pit walls, which is why the 7-10 split is impossible here rather than merely improbable. What is modelled is the part that explains why the ball does what it does.
Yes. All three games are free to play, with no sign-up.
No. The games run in your web browser on a computer, tablet or phone.
Start with the Bowling Game for a full ten frames. Use the Spare Challenge to practice classic leaves, and the Score Trainer if you want to learn how bowling scores are added up.
The ball skids on the oiled front part of the lane and hooks on the dry back end, and speed and rev rate change the shape of the shot as they do on a real lane. Some details, such as axis tilt and changing lane conditions, aren't modelled.