"HandsomeHardcore" could refer to a style or brand that's both stylish and intense. "Simony Diamond Detective" suggests a detective-themed narrative involving diamonds and perhaps themes of simony, which is the buying or selling of church offices or, more generally, selling something sacred. "Do New" might be a typo or shorthand for "do new," implying something innovative or a remake.

Make sure to highlight how each part utilizes the elements from the title. For example, the detective's stylish appearance and cutting-edge tools ("handsomehardcore"), the moral and corrupt aspects tied to the diamond trade ("simony diamond"), and the innovative gameplay ("do new").

Setting-wise, a blend of high-end locations and dark, gritty underbelly areas. The city could be a mix of opulence and hidden decay. Visual design needs to reflect that contrast—glossy surfaces vs. decaying infrastructure.

For the plot, maybe the player is a detective investigating a diamond heist or illegal trade that's linked to simony—perhaps corrupt religious figures trading sacred relics for diamonds or money. The detective, "Simony Diamond," could be a character with a personal stake, like a history with the diamond trade or a family connection.

Also, consider side cases and optional missions that expand on the main story, providing depth and replayability. A rating system based on how effectively the player solves cases and their ethical choices.

Ensure all sections are detailed but concise, allowing the feature to be comprehensive for marketing or development purposes.

I need to structure the feature with sections: Plot and Setting, Core Gameplay, Narrative Structure, Visual and Audio Style, Additional Features, and Development Notes.