In the Japanese version, the Motion-Sensor Bomb is based on the Perfect Dark Proximity Mine. Although it was changed in the US version to remove all references to Perfect Dark, the game and it's developer, Rare are still mentioned in the credits. The design of the bomb was changed, though it resembles the design used in the original Smash Bros., which was itself based on the Goldeneye 007 Proximity Mine. The trophy description calls it "a favorite covert weapon of spies and other stealthy operatives.", and the game data only says "TOP SECRET".

The PAL version uses the same design as the US version, but renames it Proximity Mine, and the description mentions the Carrington Institute from Perfect Dark. However, the game is still listed as "TOP SECRET". This is despite the PAL version being released later than the other versions.
Contributed by Spherix
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