it's been tough to search since r4 is only 2 characters. i have 3 questions regarding the r4 card: 1.) does it work with online play for all games? or does nintendo ds wifi require a unique cartidge ID to play online? 2.) do gba roms work on the r4? 3.) are there any games that are known to have issues on the r4 or on wifi with the r4? thanks!