KO Jumper, also called Knockout Jumper, on the web and on iPhone. Last changed November 1, 2026.
There are no accounts, no ads, no tracking and no analytics. Everything in the game is free.
Your settings and your best score. Removing the app or clearing this site's data deletes them, along with the guest id below.
A random guest id. It is kept on your device and sent when you play online, so you can get back into a match if your connection drops. It isn't tied to your name, your email or anything else about you, and the server doesn't keep it after the room ends.
Your moves and the state of the match, so everyone in the match sees the same thing. They aren't stored once the match ends.
Your character and color. They are shown to the others in your match, and aren't stored once the room ends.
Which platform you are on and the game's version numbers. The version numbers let the server tell whether your version can still play.
Your IP address. The game uses it only to limit how many connections one address can make, and doesn't store it.
Practice plays entirely on your device. Whenever the game starts, whichever mode you choose, it reads a small settings file from the game's site, to learn whether online play is open. That request carries nothing about you beyond what any request to a website does.
The game runs on Cloudflare, which carries the connection between your device and the game, and uses your IP address to do that and to run your room in a data center near you. We don't sell or share anything, because we don't keep anything to sell or share.
We don't ask for or collect personal information from anyone, of any age. There are no typed names and no chat.
Contact details coming soon