Running in browser is new feature. You can run dos game directly in browser, without any installation (provided your system has some version of Java). At the moment we're NOT supporting saves. Once you close browser, your saves will be gone.
Is dialog with security error being shown ? Fix it here.
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<p> This game requires Java to function. Please either enable it in your browser, switch to a Java capable browser, or download the appropriate version off of <a href="http://www.java.com">Oracle's Java Website</a> </p>