For those of you with the American version of Smash Brothers 4 in cartridge form, could you look at your cartridge back and check something? Look at the writing in white in the green area above the gold-plated contacts. Above the leftmost contact should be a ▼. What do you have on your cartridge, what serial number is the cartridge, and what firmware update does your cartridge contain? To determine your cartridge's firmware update, just boot your 3DS without Gatewait and try to run it. NOTES: 1. Censor the last 3 digits of your cartridge's serial number. 2. The number before the U in the firmware update is irrelevant, because cartridge-based firmware updates don't update the browser. Here are my 3 Smash Brothers 4 cartridges: AXCEX41*** ▼ DS O-8 D01-10 8.1.0-*U AXCE151*** ▼ DS B-9 D01-10 8.1.0-*U AXCE152*** ▼ DI X-4 D01-10 9.2.0-*U So far, the distinguishing mark is DI instead of DS in the green area, or possibly the serial number. If the serial number is the only useful distinguishing mark, I've already cut the boundary between the two versions very close. In case you're wondering, there appear to be two masters for this game. One of them comes with game version 1.0.1 and firmware 8.1.0-*U, and the newer one comes with game version 1.0.4 and firmware 9.2.0-*U.