Alpha is the fourth stage in the development of Minecraft replacing Infdev. It is the version that also limited the game-mode to survival, but saw a re-release of multiplayer. Notch started Alpha on June 29, 2010, and ended on December 20th, 2010. Bug fixes and tweaks could happen throughout the week, appearing on the game’s development blog. Major additions and changes appeared in ‘Seecret’ Friday updates made players discover the included new features. Alpha is the first versions that have to be purchased though the price increased in later stages.