In order for you to play MouseCraft on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 12.04 32-bit or Ubuntu 12.10 32-bit
Memory (RAM):
512 MB RAM
Graphics Card:
OpenGL 2.0 compatible video card with 256 MB shared or dedicated RAM (ATI or NVIDIA)
Storage:
1200 MB available space
In order to play MouseCraft on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 12.04 32-bit or Ubuntu 12.10 32-bit
Memory (RAM):
1 GB RAM
Graphics Card:
OpenGL 2.0 compatible video card with 512 MB shared or dedicated RAM (ATI or NVIDIA)
Storage:
1500 MB available space