I highly enjoyed TIS-100 and Shenzhen-IO, though I'm not even close to completing either. They wouldn't make you better at a specific language (even assembly, s

I highly enjoyed TIS-100 and Shenzhen-IO, though I'm not even close to completing either. They wouldn't make you better at a specific language (even assembly, since they use a pseudo-assembly) but I think they'd be useful to get better at problem solving and breaking down algorithms into their most basic parts.