Here is an overview of each game, via Nintendo:
Mario Party launched for the Nintendo 64 system in 1999 and was the original party-starter for the series! In this classic four-player party game, you’ll join Mario and friends across nine action-packed Adventure Boards and 56 minigames in colorful multiplayer* (or solo!) competition.
Mario Party 2
Keep the party going with Mario Party 2 and celebrate like it’s the year 2000 all over again! Mario and his Mushroom Kingdom friends return for another round of Bowser-bashing board-game action, complete with fancy costumes, new Adventure Boards and minigames.
Watch a trailer below.
Mario Party and Mario Party 2 Trailer