I've done this quite a bit. I have two copies of Fire Emblem Rekka No Ken, two copies of Pokemon SoulSilver (one English one Japanese), three copies of Smash 4 (3DS Japanese, 3DS English, Wii U), two copies of SoulCalibur IV and V (360 and PS3), Sonic Adventure three times (Gamecube, XBL, Steam), Sonic Adventure 2 twice (Gamecube, XBL), the Walking Dead (Vita, Steam), Final Fantasy IV three times (SNES, GBA, DS, and I still want the PSP version lol).....and others. The most notable to me, though, is the fact that I somehow ended up with two copies of Poker Night 2 (PSN, Steam). This is notable to me because I don't even know how to play poker.