Once in the colorful world of Mushroom Kingdom, the brave Mario and his adventurous brother, Luigi, were preparing for a new journey. They had just received a letter from Princess Peach, who needed their help.
The letter said that Bowser, the mischievous turtle-like creature, had stolen all the magic stars from the kingdom. These stars were what made Mushroom Kingdom so special and full of enchantment. Without them, the kingdom would lose its magic forever.

Mario and Luigi knew they had to set off on an adventure to find the stolen stars and bring back the magic to Mushroom Kingdom. They hopped into their trusty red and green car and started driving towards new horizons.

On their way, the brothers encountered many challenges. They had to jump over big gaps, defeat tricky monsters, and collect power-ups to help them along the way. They traveled through forests, deserts, underwater kingdoms, and even soared high in the clouds.

Along their journey, they met new friends like Toad, a helpful little mushroom guy, and Yoshi, a friendly dinosaur with a long tongue. Together, they faced a giant, fire-spewing dragon called Bowser Jr. and managed to retrieve a few magic stars.

But there was still a problem. They had no idea where Bowser had hidden the rest of the stars. So they decided to ask the friendly animals of Mushroom Kingdom for help. Mario used his special whistle, and soon, the sky was filled with colorful birds that carried their request for assistance.

As they continued their quest, the brothers discovered the entrance to a hidden world where Bowser was believed to have hidden the missing stars. The entrance was guarded by a ferocious-looking creature named Wiggler. To pass, Mario and Luigi had to solve a riddle: "What has keys but can't open locks?"

Can you help Mario and Luigi solve the riddle too?