Sure! Here's an example of a simple game where numbers count up in a box and gradually multiply, making the counting faster:
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In this game, a box is displayed on the screen with a starting number of 0. The count increases by a multiplier value, which is initially 1. After each count, the multiplier value increases by 1, making the counting faster. The count and multiplier values are displayed inside the box.
The speed of counting up gradually increases by reducing the timeout value using the formula `timeout = Math.max(1000 - (multiplier * 100), 100)`. This means that the counting speed increases by 100 milliseconds after each update, but it will never be less than 100 milliseconds.
Note: To view and run the game, copy the provided code into a new HTML file and open it in a web browser. The game is designed to work on smartphones.