You could play a version that you wrote yourself...
It's actually not that difficult --- it's probably one of the most cloned/ported puzzle games, but almost always called something other than Tetris because their lawyers really don't want you using that name. "Russia Block" is/was a relatively common synonym.
It’s easy if you just want to get the basic game up and running. If you want an authentic experience, however, then you need to put in more work to replicate the quirks of the NES original (the version used for CTWC). There’s everything from the NES’s 60.0988 frames per second to the Nintendo rotation system, delayed auto shift, soft drop speed, to the random piece generator (which is biased against line pieces). There’s also the scoring rules, gravity level progression, and more.
The game mechanics are actually quite complex when you include all of the details. Sure, you might say those details are superfluous, but there’s a reason many people prefer classic Tetris over more recent versions. Nintendo’s original mechanics are much more challenging but also very satisfying to play with.
It's actually not that difficult --- it's probably one of the most cloned/ported puzzle games, but almost always called something other than Tetris because their lawyers really don't want you using that name. "Russia Block" is/was a relatively common synonym.