How to make hard to hack leaderboards Okay, someone tasked me to make a leaderboard for their game. However, the one I have right now is really insecure. All it does is check if someone is in the top 100, and if they are, post the score to the server, where the server will completely trust the client to give a real score. My question is How would I make it harder, or better, impossible, to send a fake high score, because right now they can just post a value to an easy to find endpoint. Clarifications The game is running in an interpreted environment, therefore obfuscation is not practical, and the game has a lot of input (an hour's worth at least), so sending that to the server is also impractical.