An example of a video game that made extensive use of open playtesting is Minecraft, which was made available for purchase in its pre-alpha stages. This both helped to financially support the game and provide feedback and bug testing during its early stages. Playtesting began even before the game features included multiplayer or the ability to save games. Mojang continues to make use of playtesting with "Minecraft" through weekly development releases, allowing players to experiment with unfinished additions to the game and provide feedback on them.