Simple, Write some games and write how much you've completed them! I'll start with my 3DS Games. Theres not many but it's all I have.
Mario Kart 7: 75%+ (3 Stars on All Cups, Almost All Parts)
Rayman 3D: 40%+ (Not too Sure, Ending Half of Levels, Not Many Lums)
Starfox 64 3D: 70%+ (Easy Path Complete, Normal Path Complete, Hard Path 50%)
Super Mario 3D Land: 90% (Completed All Levels w/ Mario, All Medal Things, Almost Finished w/ Luigi)
The Legend of Zelda: Ocarina of Time 3D: 50% (100% Normal Run, Hardly Started Master Quest)
I should probably play Rayman 3D a bit more and get a higher percentage. Maybe JoshJepson's LP will help with Lums.
Mario Kart 7: 75%+ (3 Stars on All Cups, Almost All Parts)
Rayman 3D: 40%+ (Not too Sure, Ending Half of Levels, Not Many Lums)
Starfox 64 3D: 70%+ (Easy Path Complete, Normal Path Complete, Hard Path 50%)
Super Mario 3D Land: 90% (Completed All Levels w/ Mario, All Medal Things, Almost Finished w/ Luigi)
The Legend of Zelda: Ocarina of Time 3D: 50% (100% Normal Run, Hardly Started Master Quest)
I should probably play Rayman 3D a bit more and get a higher percentage. Maybe JoshJepson's LP will help with Lums.