The Game Drops $65k on Custom Prince Painting

The Game is makin' it PURPLE rain in his living room ... thanks to a massive custom painting he commissioned in Prince's honor ... TMZ has learned.

Sources tell us Game hired artist Madsteez the day Prince died and asked him to create a tribute piece. The rapper -- who came thiiiis close to recording with Prince -- picked out a shot from "Purple Rain" as inspiration.

We're told Game dropped $65k on the artwork, which took Madsteez more than 100 hours to complete. The 8' x 6' portrait is a combination of oil, acrylic and spray paints -- and, as of Sunday, has been hanging proudly in Game's crib.