Minecraft of the alpha version of the game expanded. Persson continued to update the game with releases distributed to users automatically. These updates included new items, new blocks, new mobs, survival mode, and changes to the game's behavior (e.g. how water flows). To back the development of "Minecraft", Persson set up a video game company, Mojang, with the money earned from the game. On 11 December 2010, Persson announced that "Minecraft" was entering its beta testing phase on 20 December 2010. He further stated that bug fixes and all updates leading up to and including the release would still be free.
Minecraft mods that at first he was "too afraid to mod Minecraft at all", but learned to appreciate it when he realized that modding "Minecraft" is "pretty forgiving". Eddy does nevertheless mention that he feels Mojang's fast development pace regarding the main game has slowed down the progress of the most popular mods. Similarly, Benjamin Abbott of "Metro" agrees that adding mods to "Minecraft" is "a thorough pain in the backside", though he concedes that "the result is usually worth it". Matt Smith of "MakeUseOf" says he is disappointed with most of the "Minecraft" mods available, claiming they don't modify the game