If you are looking at a physical Japanese copy of the game, you can identify the revision by inspecting the inner ring (the matrix code) on the shiny underside of the Wii disc:
The unique ID for the Japanese release of Bomberman Land Wii is . R: Identifies the platform (Wii). BM: Identifies the game title ( Bomberman Land ). J: Identifies the region (Japan). 18: Identifies the publisher (Hudson Soft). Checking the Inner Ring (Physical Discs) bomberman land wii japan rev 1
Introducing updated security checks to deter the use of early modchips and backup launchers. Technical Specifications and Identification If you are looking at a physical Japanese
Bomberman Land Wii (ボンバーマンランド Wii) UPC: 4988607500320 Context for "Rev 1" bomberman land wii japan rev 1