Minecraft 1.8.1 Free!
(Description from Official Site)
Minecraft is a game about breaking and placing blocks. At first,
people built structures to protect against nocturnal monsters, but as
the game grew players worked together to create wonderful,
CPU : Intel P4/NetBurst Architecture or its AMD Equivalent (AMD K7)
RAM : 2GB
GPU : Intel GMA 950 or AMD Equivalent with OpenGL 1.2 Support
HDD : At least 90MB for Game Core and Sound Files
Java Runtime Environment (JRE) 6 or up is required to be able to run the game.
CPU : Intel Pentium D or AMD Athlon 64 (K8) 2.6 GHz
RAM : 4GB
GPU : GeForce 6xxx or ATI Radeon 9xxx and up with OpenGL 2 Support (Excluding Integrated Chipsets)
HDD : 150MB
Please note that you could not play on premium servers.
How to Install and Play