Apparently, this trend continues. For Talos Principle, they programmed bots to solve the puzzles. These boys could learn how to solve puzzles by watching humans

Apparently, this trend continues. For Talos Principle, they programmed bots to solve the puzzles. These boys could learn how to solve puzzles by watching humans do it. They would then run the bots as an automated test suite to test if any of the puzzles were made impossible as a result of engine or level changes, and if there were any places where a bot could get stuck.