On Linux

First go to the build folder and make sure everything is compiled by running cmake .. && make -j numberofcores. If that succeeds you can go to build/bin folder and run ./Pong to run the sample pong game. You can run tests with make like this (make sure to be in the build folder): cmake .. && make check -j numberofcores.

On Windows

Start by opening build/Leviathan.sln. Then make sure you have selected RelWithDebInfo as the active configuration (and make sure arch is x64) in visual studio and then to run the Pong sample right click the project and set as startup project then press the green arrow in "Local Windows Debugger" or press F5. You can also run LeviathanTest like this to verify that individual tests of the engine run correctly.

See also: Getting started tutorial