ACF1: Fix Lua error when hitting Attack after failing the rope challenge
"difficulty" variable was falsely set to 0 in this case, but only 1 or 2 are allowed
Directory for automated tests to test the engine.
Run `ctest` in the root directory of this repository to run all tests.
Run `ctest -R <test name>` to run only the test with the given name.
This requires you to have CMake.