From the Super Mario Wiki, the Mario encyclopedia
Monster Attack! is one of the fifth routes players can travel in the River Survival mode of Super Mario Party.
The route starts with a gradual left turn with a Dash Panel ramp, followed by a gradual right turn amidst some Bloopers and the first Minigame Balloon. A waterfall then follows, along with some notes that stretch across two more waterfalls that unveil the second Minigame Balloon. The players reach the 4,500-meter mark and some Dash Panel ramps immediately afterward, followed by a slight left waterfall. A Mega Blooper then attempts to suck in the players, who must paddle to escape. After a long waterfall with intermittent rocks and + Clocks, the players reach the goal.