THANK YOU so much, I was stumped for a while because I was determined to do it myself. But I came here and saw your post. I was having issues with the bunny/bunny tile too (I think) >n<
Finally something in my wheelhouse!
You found a key! Everyone seems quite tired and worn down. You decide to move straight on to the Silver Room.
It appears to be 2048; first with pictures then with numbers.
HOW TO PLAY: Use your arrow keys to move the tiles. When two tiles with the same image touch, they merge into one.
Fuck I love this game.
2048 is the name of a game. I've never played it, but I googled how to.
- It's Subeta's version of a game called 2048. You combine matching tiles by sliding them into each other to produce a single tile of double the value. If you look closely at the tiles in Subeta's version, you can figure out the values of each tile. 2 gems, 4 gold nuggets, a spider with 8 legs, rocks in the form of the number 16, etc.
To finish the challenge, you just need to create a single 512-point tile. I think you can keep playing past that if you want, but that's the minimum to qualify. Once you get that tile, click the button below the game to submit your score and get the key.

Sequence is: red/blue gem (2) , yellow eggs (4) , spider totem (8), mossy stones (16) , 32 tile, 64 tomb tile, Tiger Head 128, 256 stone, 512 Scroll!
LOL we'll just keep trying.XD We'll get there eventually.
Now that I know what is going on, this is fun. I can't get higher than 256 though!! XD
Game Tips & Tricks
Take It Slow Take your time - there's no penalty for thinking your moves through after all. Also, try to predict where new blocks might come in and how you could deploy them.
Work The Corners In order to win the game you should have a specific strategy. So, a good strategy is to always keep your highest value tile at one of the corners. Just choose one corner and direct all your tiles there.
How to make the highest valued tile in the right bottom corner and not to move it? To make sure it is not moved, you have to make the last row always filled by pushing the down arrow so that the use of Left and Right Arrow would not move the highest valued tile.