There is a TOLL GATES game at http://www.html5pcode.com/a1ytollgates.htm The game uses a p-code. The p-code was written in HTML5 JavaScript.
The home page is http://www.html5pcode.com
There are 12 walls. Each wall has 8 gates. You must pass thru one of the gates in each wall. There is a TOLL for passing thru a GATE. There is also a cost for moving from one column of GATES to another column. You are to minimize the total of the costs. You can view a DYNAMIC PROGRAMMING (DP) solution to the game. There are 100 different games.
This game is written in a p-code. The p-code is executed by a p-code engine. If you click on PROGRAM in the RED STRIPE at the top, you can view the p-code programs. The p-code engine can execute the programs and it can edit the programs.There is a DATA option that allows you to see the program's data as it is being executed. There is a TRAIL option that allows you to execute the program in small steps. There is an RT, Real Time, option that allows you to change the program as it is executing. There are many YouTube videos that will show you how it works.