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    <p>The answer to your specific problem lies here:</p> <pre><code>$.each(playerList, function (i, currentPlayer) { if (!pressedKeys[e.which]){ //set interval for the function pressedKeys[e.which] = setInterval(function() { Move(currentPlayer.id, currentPlayer.x, currentPlayer.y, currentPlayer.size, currentPlayer.speed, e.which); }, 0); } }); </code></pre> <p>Let's say <code>w</code> is pushed. This code iterates through the player list, beginning with Player 1 (<code>currentPlayer.id</code> is 0). Let's say that initially <code>pressedKeys</code> is empty. Since <code>w</code> was pressed, <code>pressedKeys[87]</code> is set to be a pointer to this new interval, which runs <code>Move</code> every 0 milliseconds.</p> <p>So <code>Move</code> runs. However, you have this check in <code>Move</code>:</p> <pre><code>if(checkId == 0) ... </code></pre> <p>Since 'w' is only valid for Player 2 (<code>checkId</code> is 1), nothing happens and <code>Move</code> returns.</p> <p>Then we go back to your <code>$.each</code>. Now we get to work with Player 2. However, we reach this:</p> <pre><code>if (!pressedKeys[e.which]) ... </code></pre> <p>But <code>pressedKeys[87]</code> is already set. Nothing happened, but it was set. So the program skips over this step and moves on. Hence, none of Player 2's actions will ever work.</p> <p>You could do something like this:</p> <p>Add an array with the keys that are valid for each player. Before doing <code>if (!pressedKeys[e.which])</code>, check if the key that has been pressed is valid:</p> <pre><code>if (validkeys[currentPlayer.id].indexOf(e.which) == -1) return true; </code></pre>
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    1. COThanks very much, I see the problem now. What else do you not like / would you change there?
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    2. COSee my latest edit.
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