GBA games like Drill Dozer, Yoshi's Universal Gravitation and Warioware Twisted the way they were meant to be played.
I bought this games, and I think that real catridge is only way to play this games "the way they were meant to be played", .... aldough I didn't try them yet on K1 unit...(I will try them and report here)
Adding RTC (for one-two games) and tilt for 2 games is something what will make device more expensive to produce and sell (and those features is needed for max 4 games) ....
I don't know, if I were manufacter of device, I'd rather add in specs that for those games is needed real catridge (or pached ROM so game can be used without thoose features), .... maybe provide patches for that ROMs in download folder for K1. (paches are not illegal ?!?)
I'd rather provide battery for saving DRAM/SRAM, so when I shutdown unit in middle of game, and later when I power-up unit that save file is copyed from memory to SD card (like on EZ-Flash IV), .... and
that feature is usefull for 99 % games ....
...I noticed that when I use ziped files, that games that are 32 MB cannot be uncompressed (I get something like this: "There is not enough memory, press B to continue"), so games that are 32 MB can be used only if uncompressed (.gba format)... smaller games works fine, ... so far I did not find any game that is not working, or is working bad...
Battery is working around 5 hours, and I get red light depending on game I started, .... also battery indicator in main menu sometimes show full battery, few minutes later - empty, .... few minutes later half, .etc... so this is not reliable, also red light is freaking light show, ... also not reliable, .... but I get unit working for 5-6 hours beafore it shutdown itself.....