The plot could be about a ghost who used to be a racer. Maybe he died in a tragic racing accident. Now, as a ghost, he's forever bound to the racing track. He's sad because he can't move on or relive his passion for racing in a proper way.
Well, perhaps in the racing game, there was a character who was wrongly accused of cheating in a big race. This led to his downfall and eventually his death. His spirit now haunts the game as a ghost. He's sad because his name was never cleared, and all he loved was the pure sport of racing.
It could add an eerie atmosphere to the gameplay. For example, the ghost might appear randomly during races, causing a momentary distraction for the player.
One sad story could be about a horse that was severely injured during a race and had to be put down. It was a young and promising horse, full of energy, but a bad fall on the track led to irreversible damage.
One example could be 'Forza Horizon 4'. Although it's not strictly a'sad' game in the traditional sense, some of the storylines in the game can be quite poignant. The changing seasons add a layer of melancholy as you watch the beautiful landscapes transform over time. Another could be 'Grid'. The cutscenes and the story of rising through the ranks in the racing world can have some bittersweet moments as you face setbacks and rivalries.
Perhaps Celly had a pet that she loved very much. One day, the pet ran away and never came back. Celly searched everywhere for it, asked the neighbors, put up posters, but still no sign of the pet. She missed the pet's company, the way it would greet her when she came home, and this made her really sad.
Maybe it's about a haunted house where some tragic events occurred in the past, like a family being torn apart by illness or misfortune, and the lingering sorrow still fills the house.
The plot could be that Silver gets trapped in a time loop where he keeps seeing Blaze die over and over again. Each time he tries to save her, but fails. His love for her is strong, but he's powerless against this cruel fate, and his despair grows with each loop.
The puppy could be lost. It wanders around the streets, not knowing where to go. Every time it sees a person, it hopes that it's its owner coming to find it. But no one stops to help. It gets hungrier and thirstier as days pass.
A sad plot could be that an MLP loses its home. Maybe due to a natural disaster like a huge flood or a wildfire. The pony has to flee, leaving behind all its memories and possessions. It then has to struggle to find a new place to live, facing rejection from other pony communities because they are afraid of overcrowding or don't trust the new pony. The pony feels lost, alone and sad, constantly reminiscing about its old home and the happy times it had there.
Perhaps the mime is in love with someone who doesn't notice him. He follows her around in his mime world, always a few steps behind. His movements are gentle and longing, like when he mimes opening a door for her but she just walks through without seeing him. His face shows a constant state of heartbreak as he tries to get her attention but fails every time.
Well, it could be about a player who worked really hard on building their dream virtual house in Roblox but then lost it all due to a glitch. They might have spent days gathering resources and designing every little detail. It's really sad when all that effort goes to waste just like that.