I had Cubic Ninja and use your blargSnes Version 1.2 emulator on my red 3DS XL with Toshiba SDHC 4 GB - Class 4 and working fine. I love your snes emulator.
I filled my report for you to see here for proof of working and not working games. I had test some games list:
Working
7th Saga, The (USA)
Breath of Fire (USA)
Breath of Fire II (USA)
Bust-A-Move (USA)
Donkey Kong Country (USA)
EarthBound (USA)
Final Fantasy II (USA)
Final Fantasy IV (Japan) (Rev 1) [En by J2e v3.21] [Bug Fix by Deathlike2 v1.0a] (Yang's HP Fix)
Inindo - Way of the Ninja (USA)
Kirby's Dream Course (USA)
Legend of the Mystical Ninja, The (USA)
Legend of Zelda, The - A Link to the Past (USA)
Lufia (Europe)
Megaman VII (USA)
Megaman X (USA)
Pac-Attack (USA)
Pac-Man 2 - The New Adventures (USA)
Paladin's Quest (USA)
Shadowrun (USA)
Soul Blazer (USA)
Super Bomberman 2 (USA)
Super Bomberman 4 (English - Translated)
Super Bomberman 5 (Japan)
Super Mario All-Stars + Super Mario World (USA)
Tecmo Secret of the Stars (USA)
Terranigma (Europe)
Tetris & Dr. Mario (USA)
Tetris 2 (USA)
Ys III - Wanderers from Ys (USA)
Working - Glitch, hang up, bugs
Lemmings (USA) - 2 Vertical line sides of gray flashing World glitch
Secret of Evermore (USA) - fly over World glitch
Tetris Attack (USA) (En,Ja) - World color glitch
Tecmo Secret of the Stars (USA) - messages then hang up - black (To get work, press start to skip messages then no hang up)
Arcana (USA) - messages then unplayable
Kirby's Avalanche (USA) - can't move select stages
Megaman X2 (USA) - 3 errors
Megaman X3 (USA) - 3 errors
Not Working - black screen, hang up
Brain Lord (USA) - black screen
Brandish (USA) - black screen
E.V.O. - Search for Eden (USA) - black screen
Final Fantasy III (USA) - black screen
Illusion of Gaia (USA) - black screen
Incantation (USA) - black screen
Kirby Super Star (USA) - black screen
Lagoon (USA) - black screen
Lemmings 2 - The Tribes (USA) - black screen
Lost Vikings II, The (USA) - black screen
Lost Vikings, The (USA) - black screen
Lufia & The Fortress of Doom (USA) - black screen
Mario's Time Machine (USA) - black screen
Might and Magic II - Gates to Another World (Europe) - hang up
Might and Magic III - Isles of Terra (USA) - black screen
Pac-in-Time (USA) - black screen
Robotrek (USA) - messages then black screen
Seiken Densetsu 3 (Japan) [En by LNF+Neill Corlett+SoM2Freak v1.01] [Hack by Parlance v1.0] (3 Player Edition) - hang up on music test
Star Ocean (Japan) [En by DeJap v1.0] - black screen
Super Bomberman (USA) - black screen
Super Bomberman 3 (Europe) - hang up on hudson soft logo
Super Mario Kart (USA) - hang up on nintendo logo
Super Mario World 2 - Yoshi's Island (USA) - black screen
Wario's Woods (USA) - black screen
Ys IV - Mask of the Sun (Japan) [En by Aeon Genesis v2.0] - black screen
Black screen, Frozen, error to restart - need to restart system
Chrono Trigger (USA) - black screen
Final Fantasy - Mystic Quest (USA) - black screen, unsupport vram
Final Fantasy V (Japan) [En by RPGe v1.1] [Hack by JCE3000GT v1.0] (Easy Type) - black screen
Final Fantasy VI (Japan) [En by RPGOne v1.2b] [All Bug Fixes] - black screen
Harvest Moon (USA) - error to restart
Kirby's Dream Land 3 (USA)
Lufia II - Rise of the Sinistrals (USA)
Romancing SaGa 3 (Japan) [En by Mana Sword v0.30]
Secret of Mana (USA) - hang up on squaresoft logo
Super Buster Bros. (USA)
Super Mario RPG - Legend of the Seven Stars (USA)
Tales of Phantasia (Japan) [En by DeJap v1.2] (Upper Case Font)