Months ago when working on our final student project in term 5 and 6, one of the difficulties of our core mechanic was how to actually teach it to the player. If we told the player verbally how to play while they were experimenting, they were able to take what we told them and what they were experiencing to figure out exactly what was going on. When we got to the point where we were having blind playtests without talking to the players, it became a very different story.
Even if we typed out the exact words that we would verbally tell the player, “When your pack is the opposite colour of the surface, you will bounce. When it is the same color, you will slide.” It took players a long time to figure out exactly what that meant. We tried to simplify it down by introducing the inter-workings of these mechanics down, and trying fancy word graphics that were colored to match what color we wanted you to be, but it still wasn’t enough. Too many player’s still were not able to understand what we were trying to teach them by the end of our tutorial to set them up for the rest of the game.