Propose a new game for the leaderboard.
Haven't built your game's on-device QR submission yet? Download the QR SDK (v2) -- the encoder, a pixel-mode renderer, a worked example and the integration guide (start with INTEGRATION_GUIDE.md). This form captures the same spec that package's submission template asks for -- fill it out from your own finalized payload design.
The two extras are just extra art for your game's own leaderboard page later (a title screenshot, gameplay GIF, etc.) -- not shown on the main grid tile, and not built into a page automatically (see the note below).