===================================================================
--- original.js
+++ change.js
@@ -322,8 +322,9 @@
 var clueWord = '';
 var costForLetter = 10; //Coût pour l'indice de la première lettre
 var costForWord = 5; //Coût pour l'indice du mot
 var costForDrop = 10; //Coût pour l'indice drop letter
+var rewardForLetter = 10;
 var rewardForEmpty = 50;
 /**** 
 * Game zones and backgrounds
 ****/ 
@@ -446,33 +447,28 @@
 		//On vide la grille des lettres formant le mot final apres x secondes
 		LK.setTimeout(function () {
 			var tableauFrom = wordGrid.cellsPositions();
 			for (var i = 0; i < tableauFrom.length; i++) {
-				var image = createImageToSrollRescale('RewardsCoin', tableauFrom[i].x, tableauFrom[i].y, {
-					xToReach: game.width / 2,
-					yToReach: MainZone.y - scoreText.height / 2,
-					nbTicksLeft: Math.floor(Math.random() * 30) + 40,
-					valueToAddToScore: 10,
-					soundOnEnd: 'SoundRewardCoin',
-					isDestroyedOnEnd: true,
-					animate: true
-				});
-				imagesToScrollRescale.push(image);
+				var ticks = Math.floor(Math.random() * 30) + 40;
+				scrollCoins(1, 'RewardsCoin', tableauFrom[i].x, tableauFrom[i].y, ticks, rewardForLetter, 'SoundRewardCoin', game.width / 2, MainZone.y - scoreText.height / 2);
 			}
+			if (isWordInMainList) {
+				//Si le mot est dans la liste principale, on compense les lettres utilisées avec récompense
+				for (var i = 0; i < wordGrid.gridColumns; i++) {
+					mainGrid.setLetter(wordGrid.cells[0][i].columnFrom, wordGrid.cells[0][i].lineFrom, wordGrid.cells[0][i].letter);
+					var xAbsCell = wordGrid.cells[0][i].columnFrom * wordGrid.cells[0][i].cellSize + mainGrid.x + wordGrid.cells[0][i].cellSize / 2;
+					var yAbsCell = wordGrid.cells[0][i].lineFrom * wordGrid.cells[0][i].cellSize + mainGrid.y + wordGrid.cells[0][i].cellSize / 2;
+					LK.setTimeout(function () {
+						scrollCoins(1, 'RewardsCoin', xAbsCell, yAbsCell, 30, rewardForLetter, 'SoundRewardCoin', game.width / 2, MainZone.y - scoreText.height / 2);
+					}, 1000);
+				}
+				isWordInMainList = false;
+			}
 			wordGrid.resetGrid();
 			initWordGrid();
 		}, 1000);
 		if (mainGrid.isEmpty()) {
-			var image = createImageToSrollRescale('RewardsCoin', mainGrid.x + mainGrid.width / 2, mainGrid.y + mainGrid.height / 2, {
-				xToReach: game.width / 2,
-				yToReach: MainZone.y - scoreText.height / 2,
-				nbTicksLeft: 30,
-				valueToAddToScore: rewardForEmpty,
-				soundOnEnd: 'SoundEmptyGrid',
-				isDestroyedOnEnd: true,
-				animate: true
-			});
-			imagesToScrollRescale.push(image);
+			scrollCoins(1, 'RewardsCoin', mainGrid.x + mainGrid.width / 2, mainGrid.y + mainGrid.height / 2, 30, rewardForEmpty, 'SoundEmptyGrid', game.width / 2, MainZone.y - scoreText.height / 2);
 			isMGRefillrequired = true;
 		}
 	} else {
 		//Le mot n'est pas valide, on remet les lettres dans la grille principale
@@ -568,9 +564,10 @@
 	//On change la couleur des lettres d'un des mots au hasard de mainGrid.words
 	if (mainGrid.words.length >= 1) {
 		var randomIndex = Math.floor(Math.random() * mainGrid.words.length);
 		var word = mainGrid.words[randomIndex];
-		mainGrid.colorWordCells(word, "#FF5500");
+		var randomColor = Math.floor(Math.random() * 16777215).toString(16); //On choisit une couleur au hasard parmi 16777215 couleurs
+		mainGrid.colorWordCells(word, "#" + randomColor);
 		LK.setTimeout(function () {
 			mainGrid.colorWordCells(word, "#000000");
 			scrollCostCoins(clueButtonWord.x, clueButtonWord.y, word.length, costForWord);
 		}, 3000);
@@ -614,14 +611,15 @@
 		}
 	} else if (!wordGrid.isEmpty() && clueWord != '') {
 		//On reconstitue le mot contenu dans wordGrid
 		var word = wordGrid.firstWord();
-		if (word == clueWord.substring(0, wordGrid.gridColumns)) {
-			var letter = clueWord[wordGrid.gridColumns];
+		var letterRank = wordGrid.gridColumns;
+		if (word == clueWord.substring(0, letterRank)) {
+			var letter = clueWord[letterRank];
 			//On descend la suite du mot
 			mainGrid.findNclickCell(letter);
 			if (word != clueWord) {
-				scrollCostCoins(clueButtonDrop.x, clueButtonDrop.y, 1, costForDrop);
+				scrollCostCoins(clueButtonDrop.x, clueButtonDrop.y, 1, letterRank * costForDrop);
 			} else if (word == clueWord && word != '') {
 				clueWord = '';
 			}
 		} else {
@@ -717,11 +715,12 @@
 		wordGrid.addWord(word); //Archive les mots trouves
 		mainGrid.removeWord(word); //Retire le mot de la grille principale
 		isWordValid = true;
 	} else if (wordsMainList.includes(word)) {
-		scoreTest = "word in main:" + word;
+		scoreTest = "Word in main list : " + word;
 		isWordValid = true;
 		isWordInMainList = true;
+		wordsMainList.splice(wordsMainList.indexOf(word), 1); //Retire le mot de la liste principale
 	} else {
 		isWordValid = false;
 	}
 	wordGrid.colorAllCells(isWordValid ? "#00FF00" : "#FF0000");
@@ -761,23 +760,8 @@
 		var image = createImageToSrollRescale(asset, tableauFrom[i].x, tableauFrom[i].y, options);
 		imagesToScrollRescale.push(image);
 	}
 } //fin createImages
-//Fonction scrollRewardCoins : permet de faire défiler des pièces de monnaie
-function scrollRewardCoins(nbCoins, valueToAddToScore, xFrom, yFrom) {
-	for (var i = 0; i < nbCoins; i++) {
-		var image = createImageToSrollRescale('RewardsCoin', xFrom, yFrom, {
-			xToReach: game.width / 2,
-			yToReach: MainZone.y - scoreText.height / 2,
-			nbTicksLeft: Math.floor(Math.random() * 30) + 40,
-			valueToAddToScore: valueToAddToScore,
-			soundOnEnd: 'SoundRewardCoin',
-			isDestroyedOnEnd: true,
-			animate: true
-		});
-		imagesToScrollRescale.push(image);
-	}
-} //fin scrollRewardCoins
 //Fonction scrollCostCoins : permet de faire défiler des pièces de monnaie
 function scrollCostCoins(xTo, yTo, nbCoins, valueToTakeFromScore) {
 	for (var i = 0; i < nbCoins; i++) {
 		var image = createImageToSrollRescale('CostCoin', game.width / 2, MainZone.y - scoreText.height / 2, {
@@ -791,8 +775,23 @@
 		});
 		imagesToScrollRescale.push(image);
 	}
 } //fin scrollCostCoins
+//Fonction scrollCoins : permet de faire défiler des pièces de monnaie
+function scrollCoins(nbCoins, asset, xFrom, yFrom, ticksLeft, valueToAddToScore, soundOnEnd, xTo, yTo) {
+	for (var i = 0; i < nbCoins; i++) {
+		var image = createImageToSrollRescale(asset, xFrom, yFrom, {
+			xToReach: xTo,
+			yToReach: yTo,
+			nbTicksLeft: ticksLeft,
+			valueToAddToScore: valueToAddToScore,
+			soundOnEnd: soundOnEnd,
+			isDestroyedOnEnd: true,
+			animate: true
+		});
+		imagesToScrollRescale.push(image);
+	}
+} //fin scrollCoins
 //Fonction scrollRescaleImages permettant de faire défiler et redimensionner des images
 function scrollRescaleImages() {
 	for (var i = 0; i < imagesToScrollRescale.length; i++) {
 		if (imagesToScrollRescale[i].animate) {
@@ -851,8 +850,9 @@
 * Main loop
 ****/ 
 game.update = function () {
 	//Mise à jour score
+	//scoreTest = "Words left: " + wordsMainList.length;
 	updateScoreTest(scoreTest);
 	if (isScoreUpdatable) {
 		updateScore(score);
 		isScoreUpdatable = false;