So after you ended the spider minigame there's a lot of time of animation, in this time you can go right (don't forget to go a bit up or down with the arrows so your animation doesn't bug) and then enter the mousehole. You know that you are in the room if you pass your cursor a bit up from the middle and it appears for you to click, after that you are going to position your cursor a bit up to the left from the penultimate red ball, there is the only possible position to have a donut, if there is you can grab and if there isn't you can go down and immediatly skip this room after the animation of the spider minigame ends.