Unfortunately, I never got the chance to purchase a DS before due to my financial problems and being so busy with life. But recently, I bought a 3DS XL, and now I'm planning to buy a DS flashcart to enjoy what I missed. Through the previous years, I've been following the DS flashcarts news, and I have realized that the three Castlevania games have problems in playability (especially Portrait of Ruin). From what I discovered, it seems the problem lies with the read speed of the micro SD card, if the read speed isn't fast enough, the game may freeze or crashed. But in any case, I would like to know if this flashcart fixed this issue, and all three Castlevania games works perfect on it. If problem still exist, I would like any suggestions of what MicroSD card to purchase, I've read that the higher class the better to avoid any problems in read speed. So according to my local shops, I'm limited in choice between either SanDisk or A-DATA. Here is the details of each one: MicroSDHC 8GB SanDisk Ultra class 10 UHS-I, speed up to 30 MB/s (well-known brand) MicroSDHC 8GB A-DATA class 10 UHS-I, speed up to 30 MB/s (recommended by the community in here along with Transcend) If you have other suggestions, please do tell me, and thanks.