When you buy It Takes Two, you can invite someone to play with you online for free (with some restrictions). The game also supports local offline split screen.
Friend’s Pass offers cross-gen but not cross-platform play. For example, Player 1 can be playing on PlayStation 5 and invite Player 2 on Playstation 4. But Player 1 playing on Playstation 5 cannot invite Player 2 on Xbox Series X or PC. The save system also works cross-gen.