Adventure
... that the Atari 2600 game Adventure contained the first well-known instance of a video game Easter egg?
... that the <a href="./Atari_2600" id="mwBFQ" rel="mw:WikiLink" title="Atari 2600">Atari 2600</a> game <i id="mwBFU"><b id="mwBFY"><a class="mw-redirect" href="./Adventure_(Atari_2600)" id="mwBFc" rel="mw:WikiLink" title="Adventure (Atari 2600)">Adventure</a></b></i> contained the first well-known instance of a video game <a href="./Easter_egg_(media)" id="mwBFg" rel="mw:WikiLink" title="Easter egg (media)">Easter egg</a>?