Sonic Gather Battle

Sonic Gather Battle is a 2009 beat 'em-up and multiplayer fighting video game developed by Leemena and based on the engine of Little Fighter 2; it is a fan game based off the Sonic the Hedgehog series by Sega and features characters from said series, alongside Super Mario, Mega Man and Bleach; it was first released in 2014 and is continually being updated to this day.

Upon release, the game received a generally positive reception, however following a controversy related to the game's digital rights management, it is generally avoided to prevent private information from being leaked.

Controversy
On December 11, 2017, a picture was posted on the r/SonicTheHedgehog Reddit forums by a now deleted user; in it, a Discord user named LJSTAR explains that the game had a malicious DRM that would close any browser that attempted to search up the game's name with the words "hack", "cheat" or "mod", after which the game would enable its anti-cheat system which made the game unplayable. In addition, the user's PC would have their IP address uploaded to the developer's PC which would prevent the issue from being fixed by reinstalling the game, with the only way of fixing being to contact the developer to whitelist your PC.

Fan site SFGHQ did further research and found instances of the game requiring administrator access in order to run, editing registry keys and making various internet connections. The creator would be banned from any SAGE expo following it.