Redfin Prison: Key to your Cell
Collecting this named item can send a check.

COMMUNITY INTEGRATION
Shuffle weapons, keys, boss rewards and optional game systems across a JUMP KING QUEST multiworld. The v8.0 APWorld defines 870 possible network checks; 109 are active with the published default YAML.
Maintained by Daaxren, with gameplay research and testing by Rikkukun
Browse possible checks, rewards and settings. What appears in your game depends on your World options.
Browse the gameplay families that can send checks to your multiworld.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
Collecting this named item can send a check.
The supported format documented by the maintainer is a single-player game session connected to an Archipelago multiworld. Native JUMP KING QUEST online play is refused by the plugin; no shared-world game co-op is described.