Adventure Update was a major update to Minecraft focused on fighting, exploration, and adventuring, as well as other aspects. Its content was implemented in Beta 1.8 and Minecraft 1.0. The pre-releases of Minecraft Beta 1.8 and 1.9 were leaked before their official releases, and Notch approved these leaks on his twitter. Many players approved the inclusion of a long awaited Creative Mode, a game mode that removed all survival aspects of Minecraft and allowed players to focus solely on building if they wished to do so. If the player loads a pre-Beta 1.8 world and explore new chunks, the world can become corrupted, causing large walls of land to generate where new and old chunks meet, and caves to abruptly stop and start. An early version of the Adventure Update was playable by fans at Mojang's booth at PAX Prime 2011, which was held between August 26th and 28th. Because so many things were added and changed in Beta 1.8, it was criticized by many in the community. Another criticized feature was the Hunger system, which, according to some players, makes the game more challenging because hunger goes down at a rate considered by some players to be too fast.It was announced on June 10, 2011 by Notch and was initially planned to be implemented in Beta 1.7. Because of the size of the content, the first part of the update was pushed back to Beta 1.8, which became available on the 14th of September 2011 and the rest of the update being part of Minecraft 1.0, which was released on November 18, 2011.