"Hackathon" is a two-player mini-game exclusive to Sly 3: Honor Among Thieves. There are six levels, each with increasingly difficult enemies until the final level, which has a large skull-boss, similar to General Tsao's defense avatar.
Unlike the other mini-games, Hackathon is a co-op game, where you hack through various levels by defeating beasts and other security while losing as little health as possible. Bentley is Player 1 while Sly is Player 2, unless Penelope has been unlocked (if so, Penelope will be Player 2). Once a level is complete, you go into a docking station, where you will go to the next level. Each player has a health bar, and both players share 20 lives; once all the lives are gone and you lose the last of your health, it's game over.
There are asterisk-shaped power-ups in each level that occasionally appear. Here is a description of them:
- Double or triple shooter (if the player already has double, they will be awarded with a triple shooter)
- Laser that connects the two players
- Arrows surrounding the players, if one shoots the other, it will create a wave that kills enemies
- Clear the screen of enemies
- Each player controls a turret on both avatars
Points are awarded based on both players' performance. The points are for various achievements, such as completing a level, beating enemies, a time bonus at the end of the game and whether or not either player didn't die on a given level. At the end of the game, regardless of whether Hackathon was beaten, the total points are shown and compared to the current high score, which starts at zero and is replaced with every new high score.