Chrome Browser
Step 1. Click the small lock icon in your address bar. Select FLASH or SITE SETTINGS from the drop down menu.
Step 2. Select ALLOW from the drop down menu.
Step 3. Return to the game page. Click RELOAD. Your game will now be unblocked.
Google Admin Console
These instructions are intended for network and system administrators.
Step 1. Sign into the Google Admin console and select DEVICE MANAGEMENT from the home page.
Step 2. From the left side, select CHROME then SETTINGS.
Step 3. Search for PLUG-INS then select RUN PLUG-INS AUTOMATICALLY from the dropdown menu.
Step 4. Enter the following domain into the box in the section labeled ALLOW PLUG_INS ON THESE SITES.
[*.]mathplayground.com
Step 5. Click SAVE at the bottom of the page.