A hacker stole $63 million from a blockchain-based online game, Investment News reports. This is one of the largest security incidents for the crypto sector this year.

Game Munchables confirmed about what happened in a post on X and said it will try to stop the transactions. According to blockchain company PeckShield, the hacker stole 17,400 Ether worth around $63 million at current prices. Public data on crypto transactions confirm the estimates.

However, the exploiter appears to have changed his mind and returned the funds in full later that day, according to blockchain data. Munchables announced that “all user funds are safe,” in a post on X, adding in a separate post that the hacker did not insist on any conditions.

The game is built on top of Blast, a so-called Layer 2 that promises more efficient transactions than established blockchains, as well as loyalty points similar to airlines.

Gamers in Munchables try to win prizes by taking care of digital creatures. Earlier this week, the game said that the value of tokens stored in its log has passed $80 million.

According to Immunefi, a platform offering rewards to professionals who find security flaws in cryptographic software, security exploits were worth a total of about $1.8 billion last year, down about 50 percent from 2022.