This is a recreatation of the Voltorb Flip game that appears in the Korean and Western releases of Pokémon HeartGold and SoulSilver. The game is a mix between Minesweeper and Picture Cross and the placement of the bombs are given for each row and column. The goal of the game is to uncover all of the 2 and 3 tiles on a given board and move up to higher levels which have higher coin totals.
The numbers on the side and bottom of the game board denote the sum of the tiles and how many bombs are present in that row/column, respectively. Each tile you flip multiplies your collected coins by that value. Once you uncover all of the 2 and 3 tiles, all of the coins you gained this level will be added to your total and you'll go up one level to a max of 7. If you flip over a Voltorb, you lose all your coins from the current level and risk going down to a lower level.
You can read more about this project on my personal webpage and the source code is available on my GitHub. If you find any issues or have any suggestions, feel free to submit an issue or pull request on GitHub. I do not claim to own any of the assets used on this website, including the Voltorb sprite and tile background, or the Voltorb Flip game itself. Enjoy!