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Challenge 1/5 – Door District Find the map Door District. Around the map are several doors you use the power ups and the stone block hazard to break the map's floor and then enter the challenge. Use the correct power-ups to enter the hidden challenge located near the bottom of the map which is Standard Jump

Challenge 2/5 – Blizzard Eruption Find the race map Blizzard Eruption. There is a secret route you can take during the level. Following it will lead you to the challenge. (you might gonna need bjr or Luigi to access it) challenge: Bubble blast

Challenge 3/5 – Scripulous Mansion In Scripulous Mansion, first go through the first door look for a hidden line of blocks near the top of the level. It lets you pass through and enter a secret door. Inside, you'll need to navigate a dark void using the Propeller Mushroom. At the end, you'll find the challenge. challenge: Propell Pipework

Challenge 4/5 – Skyward Stalk In the vertical map Skyward Stalk, use the correct power-ups to break certain blocks and reach the hidden challenge. Challenge: Grapple gym

Challenge 5/5 – VB Land Play as Luigi in VB Land and fly to a small hidden pipe. Entering it will lead you to the final secret challenge. Challenge: Sci-float

Now you can unlock the FINAL CHALLENGE. However, it does not appear instantly ( sometimes if your lucky) Your total games played may need to be above 150-400 (or a similarly high amount). not really sure but that's how people got it

IMPORTANT Make sure you use your own Final Challenge Using another player's Final Challenge can prevent you from earning the Bombecture skin, forcing you to beat the Final Challenge again. ( trust me you don't wanna make this mistake)