Dark•Matter was a campaign published by the company that acquired what other gaming business in 1998?
Dark•Matter: Dark•Matter is a science fiction/conspiracy theory campaign setting that was originally published in 1999 by Wizards of the Coast as the second campaign setting for the "Alternity" role-playing game. Alternity:  Following the acquisition of TSR by Wizards of the Coast, the game was discontinued in 2000 as part of a broader rationalisation of TSR's business holdings, but it retains a small and devoted fanbase.
i don't know