span> via the ServiceGroup instance on a <span class='object_link'><a href="../Game.html" title="Zif::Game (class)">Game</a></span></p>
</div></p>
      
      <pre class="example code"><code><span class='gvar'>$game</span><span class='period'>.</span><span class='id identifier rubyid_services'>services</span><span class='lbracket'>[</span><span class='symbol'>:tracer</span><span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_mark'>mark</span><span class='lparen'>(</