It depends on the game. Most games currently don't support WPA/WPA2. And I agree; I don't know why the game does not follow the configuration setup from the DS itself. So even if you have a DSi that supports WPA/WPA2, if you have a game that does not support it, it won't work.
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Yes, the Nintendo DSi can play Nintendo DS games. The NDS and NDSi are compatible with each other and can link for multiplayer as well. There are really no such thing as 'DSi games' except for DSi-ware and one or two games that require the DSi camera, none of which are compatible with a DS. However, since the DSi has no GBA slot, Game Boy Advance games and DS games that require this slot (e.g. Guitar Hero: On Tour) cannot be played on a DSi. Flash carts and unofficial hardware won't work either, but there may be a newer version available, designed for the DSi. Another problem you might find is that if you have any Wi-fi capable games, they will only work with a WEP security enabled network (or of course a network without security), not WPA.
no i had to change mine back to a wep
It means that your router only supports higher security encryption: WPA-2, your DSI uses WEP Encryption. So you go to Advanced Settings in Set Up Internet Connection and it will show WPA for your wifi connection.
Yes and no.When setting up the network connection in the DSi menu settings, you have to go into the advanced settings. Only in the advanced settings are you allowed to enter a network encrypted through WPA-PSK. Why it is this way is a complete mystery but only a minor annoyance.The problem is that once you have gone through entering your network or SSID, and you go to enter your password, you discover quickly that the password must be only letters, numbers, and just a measly handful of symbols. So if you have a password with only letters and numbers, you are safe. If you have any given symbol in your network password, you're boned. Personally, I'm not comfortable only using letters and numbers in my encryption process; a mixture of symbols are a must for security purposes in WPA/WPA2 systems.Finally, and perhaps most importantly, only new DSi games that have been created to work on the DSi are capable of using a WPA2 network connection! So all your old games? They won't work. And whether or not games released after the DSi WPA2 architecture was built is completely up to the game designer. In other words, games built after the DSi was released may or may not work with WPA2.For the most part, you are stuck with a WEP network or no network play. There may be a few dozen games released in 2009 that support WPA2. The internet browser and the DSi store, however, both work perfectly fine on a WPA2-PSK protected network.
Unfortunately no, the wi-fi chip inside the Nintendo DS does support pinging WPA networks with the right software but DS games are built to only connect to WEP wi-fi connections. So sorry, but if you wanted to play on a WPA network, its not possible.