This is a RISCV Emulator that I wrote. I started 2PM and finished 4PM next day. This is the outcome. :)
half of those 26 hours were reading the ISA manual 😅 bc I'm dumb and I take ages to understand.

Making my own game console.

I work with FPGAs and have access to a bunch of pretty nice dev boards, so building a workable CPU and GPU is definitely possible. I even have architectures for both in mind, and have planned ways to get compiler support (i.e. just use RISC-V as the ISA as much as possible so that I can reuse an existing RISC-V compiler with minimal changes) so that I don't need to write assembly.

But, lack of time. Sigh.