#how wario got to planet bomber by a extra-dimensional portal

[lore-of-the-mushroom-kingdom]

How Wario Got To Planet Bomber

So on page 4 of the Wario Blast Featuring Bomberman manual there is a description about the game's plot. It says "Wario in his search for new lands to conquer and treasures to gain has found the extra-dimensional portal that links his world with the one that Bomberman inhabits." This reveals that the way Wario got to Planet Bomber was an extra-dimensional portal. This could also be how characters can crossover with each other that are from different games.