Sky3ds supports 3ds games on 3ds xl v10.2 and R4 card supports ds games on 3ds v10.2. They both can work on older firmwares to run 3ds and ds roms separately.
Sky3ds for 3ds game: This card runs downloaded 3ds roms on 3ds,new 3ds and 2ds consoles. Whatever you have US, JP, EU or other version 3ds family handhelds, you can use sky3ds on them to play multi 3ds games. The multi-rom means you can put many 3ds roms into micro memory sd card for sky3ds. Then, sky3ds can run them on Nintendo 3ds console one by one. Users just pay for one card to play over 100 3ds games! Besides this, sky3ds supports eshop access, play online, game update, download DLC at the same time. It is working on 3ds firmware liking a genuine 3ds card, so the ban thing is no need to worry! If you have 3ds v9.3 to v10.2 or you want to choose the safest flashcart for your Nintendo 3ds xl console, no other card but sky3ds is the one.
R4 card for ds game: R4 card is a group of ds game supported flashcards with R4 title. The hot items like r4i sdhc 3ds, r4i gold 3ds, r4isdhc 2015 and r4i gold eu 3ds all are the cheap and well-used ds rom hacking cards for both 3ds and dsi firmware. Their compatibility is awesome! The above R4/R4i cards when are installed with newest kernel supports 3ds 10.2.0 and dsi 1.45 without any issues. So if you buy one R4 card, you can play DS games on 3DS/NEW 3DS/2DS and DS/DSI/DS Lite handhelds. What’s more, R4 3ds card(due to the 3ds firmware compatibility, being called R4 3DS as well) can do something more than you imagine. They are bringing you Free Emulators, Apps and Multi-media functions with the bottom price from $10 to $18!
Sky3ds is the same. But Dstwo plus is a new card in 2015. What is it? and What is its features? You can know here.
Supercard dstwo+: The Dstwo Plus is all based on Supercard dstwo and is better than old dstwo with added 3ds rom support and more powerful cpu. Still released by supercard.sc and for now it has the latest Dstwo plus EOS V1.14 and GW Plugin v1.0. When it is coming into the market firstly, the card claims 4in1 card, which means supports 3DS,DS,GBA and SNES games all in a single product. In fact, the truth is Dstwo plus supports 3ds games on v4.1 to v9.1 and run nds/gba/snes games on all versions.
Dstwo Plus Features
Support a super GW plug in, you can both 3DS and DS games together. Old and newest games.
Supporting all the New 3DS,2DS,3DS consoles. (include the 9.2.0-21 and 4.1)
Support unlimited 3DS games,muti-roms
Support the exclusive GBA/SNES emulators.