To make Mahjong In Poculis to run well on Windows 8 systems, you have to download the latest version and you have to install the latest video drivers for your computer.

Click here to download Mahjong In Poculis v4.57

To get the latest drivers for your video card, just go to your video card manufacturer's website then download them (if you get drivers from Windows Update, it won't work well).
Once those drivers installed, the game will run well.

If you don't know what video card drivers are and don't know what is your video card:
- Do a right mouse clic on your Windows 8 desktop.
- Select "Screen Resolutions".
- A window appears with a path at the top starting with "Configuration panel -> ...". Select the Configuration panel.
- Clic the icon "System and Security" then "Device Manager" in the System subpart.
- The Device Manager windows appears with all the hardware of your computer. Selecting "graphic card" or "video card" will give you the name of your video card. It will surely be Intel xxx, Nvidia xxx or AMD xxx.
- Now that you know your video card manufacturer, go to its website and download the latest drivers.

Installation:
- In the preceding Device Manager window, do a right clic on your video card to uninstall the current driver. Restart the computer. Install the freshly downloaded drivers. Restart. You have a Mahjong at 60 frames per second !
To know more: http://www.overclock.net/t/1326858/windows-8-boots-but-shows-only-black-screen-with-new-nvidia-driver-310-54

Thanks to Claude C. for the tips. The next version of the game: Mahjong In Poculis v5.0, will natively work well on Windows 8 computers.