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HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/phaser/2.3.0/phaser.min.js"></script>
    <body>
        <div id="phaser">Phaser.js canvas</div>
        <p>I'm making a phaser.js game that uses key presses in combination to accomplish specific actions. Some of the puzzles require that you hold all 4 keys down at the same time.</p>
        <p>This works fine for the english key selection (T E A and M) however the french keys N O U and S won't register that they are all pressed at the same time.</p>
        <p>Help!</p>
        <br/>        
        <div id="T">The T key is up</div>
        <div id="E">The E key is up</div>
        <div id="A">The A key is up</div>
        <div id="M">The M key is up</div>
        <br/>
        <div id="N">The N key is up</div>
        <div id="O">The O key is up</div>
        <div id="U">The U key is up</div>
        <div id="S">The S key is up</div>
    </body>

JavaScript

var game = new Phaser.Game(50, 50, Phaser.AUTO, 'phaser', { create: create });
        var T_Key,E_Key,A_Key,M_Key,N_Key,O_Key,U_Key,S_Key;
        
        function create() {

            // create hotkeys
            createKey(T_Key, "T", Phaser.Keyboard.T);
            createKey(E_Key, "E", Phaser.Keyboard.E);
            createKey(A_Key, "A", Phaser.Keyboard.A);
            createKey(M_Key, "M", Phaser.Keyboard.M);

            createKey(N_Key, "N", Phaser.Keyboard.N);
            createKey(O_Key, "O", Phaser.Keyboard.O);
            createKey(U_Key, "U", Phaser.Keyboard.U);
            createKey(S_Key, "S", Phaser.Keyboard.S);

        }        
        function createKey(myKey, name, phaserHandle){
            myKey = game.input.keyboard.addKey(phaserHandle);
            myKey.onDown.add(keyDown, this);
            myKey.onUp.add(keyUp, this);
            myKey.name = name;            
        }
        function keyDown(e) {
            document.getElementById(e.name).innerHTML = "The " + e.name +  " key is down";
        }
		function keyUp(e) {
            document.getElementById(e.name).innerHTML = "The " + e.name +  " key is up";
        }