Its a game with kinda Minecraft gameplay. You can find it in Arcade, it is called "Kopatel 2D"
What I need to make is when player press Q button (for example) it saves all blocks on their position and it saves the amount of players lives. Then person who plays, close browser, shutdown his computer, go to grandma for vacation, comes back, lunches game, press E (for exmaple) and position of the blocks become exactly the same, when he left a game.