 Retail copies of games are supplied on proprietary , DVD @-@ type Wii optical discs , which are packaged in keep cases with instructions . In Europe , the boxes have a triangle at the bottom corner of the paper sleeve @-@ insert side . The triangle is color @-@ coded to identify the region for which the title is intended and which manual languages are included . The console supports regional lockout ( software purchased in a region can be only played on that region 's hardware ) . 
