diff --git a/pemFioi/blocklyCrane_lib-1.1.js b/pemFioi/blocklyCrane_lib-1.1.js
index aacbb3fde..a2c055f66 100644
--- a/pemFioi/blocklyCrane_lib-1.1.js
+++ b/pemFioi/blocklyCrane_lib-1.1.js
@@ -4,6 +4,58 @@
 var dustUrl = "crane/dust.png";
 var spotlightUrl = "crane/spotlight.png";
 
+/* variant functions */
+
+function swapColumns(grid, col1, col2) {
+    for (var row = 0; row < grid.length; row++) {
+        tmp = grid[row][col1];
+        grid[row][col1] = grid[row][col2];
+        grid[row][col2] = tmp;
+    }
+    return grid;
+}
+function swapRows(grid, row1, row2) {
+    tmp = grid[row1];
+    grid[row1] = grid[row2];
+    grid[row2] = tmp;
+    return grid;
+}
+function swapBricks(grid, type1, type2) {
+    for (var row = 0; row < grid.length; row++) {
+       for (var col = 0; col < grid[0].length; col++) {
+           var type = grid[row][col];
+           if (type == type1) {
+              type = type2;
+           } else if (grid[row][col] == type2) {
+              type = type1;
+           }
+           grid[row][col] = type;
+       }
+    }
+    return grid;
+}
+function revertHorizontal(grid) {
+    var nbCols = grid[0].length;
+    for (var row = 0; row < grid.length; row++) {
+        for (var col = 0; col < nbCols / 2; col++) {
+            var tmp = grid[row][col];
+            grid[row][col] = grid[row][nbCols - 1 - col];
+            grid[row][nbCols - 1 - col] = tmp;
+        }
+    }
+    return grid;
+}
+function removeRow(grid, row) {
+    grid.splice(row, 1);
+    return grid;
+}
+function removeColumn(grid, column) {
+    for (var row = 0; row < grid.length; row++) {
+        grid[row].splice(column, 1);
+    }
+    return grid;
+}
+
 var getContext = function(display, infos, curLevel) {
    var localLanguageStrings = {
       fr: {