Nintendo Patents Watch

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Knowledge-based discourse

Game-Key Card Technical Details from Patent Publication

The long-awaited Game-Key Card patent has been published in EU and China. Key points below (no pun intended):

  • GKC contains title info, icon image, app ID, vendor ID, cartridge ID, “etc.”
  • When inserted for the first time, console downloads app and icon from server; downloaded icon replaces the GKC icon
  • Afterward, internet is no longer needed, unless for updates
  • App can only be executed when the GKC with associated cartridge ID is inserted
  • Console “periodically” checks the insertion status and cartridge ID; if either one is negative, the app is ended
  • The eShop app and GKC app are different versions downloaded from different servers (so GKC can be supported even if eShop is down; this also explains why GKC app can be copied locally)
  • If either eShop or GKC app is already stored in memory, the system will warn you before you download the other
  • The eShop, GKC, and Game Card apps may share a save file or have separate saves (presumably determined by the dev? unspecified in patent)
  • Otherwise, GKC mostly shares the hardware design of Game Card (read more here)
Drawing from patent publication EP 4813482: FIG. 15 is a diagram illustrating a connection between the cartridge and a game apparatus or an old game apparatus
Drawing from patent publication EP 4813482: FIG. 2 is a diagram showing a flow of processes at respective components of the game system in the case where a first-type cartridge is inserted in the game apparatus
Drawing from patent publication EP 4813482: FIG. 39 is a flowchart showing an example of processing of the game apparatus when a cartridge is inserted

Source: Patent publication EP 4813482

[Originally posted on 2026-09-30 Pacific Time]