Hey this is Tom Silver, 2nd author of the ICML paper. Happy to answer any questions. Eric Purdy (u/epurdy) will be on here too - he did the Sokoban experiments.
Is it (theoretically) possible to learn concepts in one game, learn concepts in another game, and then immediately play some weird hybrid of the games that uses concepts from both? For instance, play a mash up of breakout and space invaders after learning each individually.