This Anki add-on is still in development, if you become a Patreon, you will get early access to Prototype. (This is a personally developed extension for the flashcard app Anki, so it is not related to the official Anki)
[Description]
I created and embedded progress bars and monsters battle action game at the top of Anki. The game material is used for the game. Still unstable, but it works roughly.
FileSize:150MB, I have not yet confirmed that it will work cross platform. (It's still under development.)

Animated movement. Runs with the progress bar from left to right. Various sound effects are available.
Static images, which change randomly. Knight can be defeated when he reaches the rightmost point.
Monster appears. Only green review cards are counting. New cards and relearning cards are not counting. Progress bar is still unstable and inaccurate.
When the dungeon is cleared, it becomes Colosseum. All cards are counting. Human type knight appears. You can toggle between dungeon and Colosseum by left-clicking on the monster.
Left-click on the character to count for 25 minutes.
Counts 10 seconds for each review. The number of seconds can be set to the same as the speed focus mode. The remaining time is displayed in the menu bar.
You can auto hide/show Anki when you finish the target number of cards.
Monsters light up according to the card status.
When a card is leeched, the monster roars. Older Anki are not yet supported.
Left click the monster multiple times to play environmental sounds. Rain sound, campfire sound, etc.
Right click the monster to toggle the current sound.
Right click on the knight to change the progress bar image randomly.
Download the .ankiaddon file and open it with a double-click, or install it from the "Install from file" menu in the Anki add-ons management screen. (Please note that you cannot install the file by dragging and dropping it into Anki)