Your dream is rich with symbolism and can be interpreted in several ways. Here are some insights into the elements of your dream:

1. Grandma's House: This setting often represents safety, comfort, and nostalgia. It may suggest a longing for simpler times or a connection to family and traditions.
2. Party: A gathering like this could symbolize celebration or a social aspect of your life. It may reflect your desire for connection or community.
3. Men from Nintendo: This could represent creativity, playfulness, or a desire for innovation in your life. The association with a well-known gaming company suggests a connection to your interests or hobbies, indicating that you might be seeking new experiences or challenges.
4. Levitating: Levitation can symbolize freedom, transcendence, or an elevation of thoughts and ideas. It may indicate that you are aspiring to rise above current circumstances or seeking enlightenment.
5. MOTHER 3: Although you have no personal connection to this game, the mention of it could symbolize themes of growth, family dynamics, or the complexity of relationships, as the MOTHER series often deals with deep emotional narratives.
6. Game titled "American MOTHER 3" and the word "arson": The juxtaposition of a familiar game with a strikingly unusual title could indicate a clash of expectations or a desire to redefine something in your life. The word "arson" might suggest feelings of destruction or transformation, possibly hinting at a need to let go of something old to make way for something new.
7. Balcony: Going out onto a balcony can symbolize a desire for perspective or a need to step back and evaluate your situation. It may indicate that you are seeking a broader view of your life or current challenges.

Overall, this dream seems to reflect your inner thoughts about creativity, relationships, and personal growth. It may be encouraging you to explore new interests or to embrace change in a way that feels both exciting and transformative. Consider how these themes resonate with your waking life and any areas where you might feel stuck or in need of a shift.