RR2 is a bit annoying in that it is kind of finicky. I've tested both with up to 4 and they work fine. RR2 supports 8 players, OR2006 supports 6. Start the lobby before your slave machines search for the game. Machine 1 must be used to host the wireless battle game (ridge racer 2) - or machine 1 must at least have network initialized (by going to the wireless play screen) & anyone can then host the lobby (outrun 2006). hit 'change MAC address' (just need to make sure it is different from machine #1). 192.168.1.2) of the machine running the server. On machine 2, go to settings and ensure Ad-hoc PRO server is /not/ checked put in the lan IP (e.g.
On machine 1, go to settings and ensure Ad-hoc PRO server is checked put in the lan IP (127.0.0.1 might work just as well) for the PRO ad-hoc server address and hit 'change MAC address.' TL DR: go to memstick/PSP/system/ppsspp.ini and set 'WlanAdhocChannel = 1' (it is by default 0) on your multiple machines. I have now tried this and this fix works for both Ridge Racer 2 & Outrun 2006 C2C! I have not tested others. While nothing in 1.6 was fixed that would fix ridge racer networking, I did stumble upon this wonderful issue report on github from just two months ago:, which seem proposed a workaround to get RR2 adhoc working (?!).
Looking at the 1.6 changelog got me interested in exploring PPSSPP's github.