I wouldn't say most, but this game is obviously using the R6G6B6A6 EFB pixel format.Should be the so called 'Dithering'. Apparently most Wii games are only 16bit color depth
Does this 'fixed grid' only appear when some transparency effect is going on (like smoke, fog...)? Because then i think its normal, happens on my WiiU + 4K TV too!
Should be the so called 'Dithering'. Apparently most Wii games are only 16bit color depth and the digital signal + barebone upscaling of the WiiU makes those imperfections (that you wouldn't notice on a CRT + analog composite signal back in the days on an original Wii) more pronounced then ever.