I cannot see any game screen.
PC
Please update your OS and/or Graphic Driver to the latest version.
You can use hardware acceleration via your browser settings to solve this problem.
How to use hardware acceleration:
chrome: http://bit.ly/2zaEnoI
Firefox: http://mzl.la/1xKsEca
Mobile
It can also be resolved through an OS update.
Android OS of at least 8.0 upwards recommended.
Hardware specifications of Galaxy S7 and higher recommended.
iOS support of iOS 12.2 or later versions with Safari updates.
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