Step 1

Dissolve each box of jello into its own individual container, using 1 cup of boiling water per flavor (no more than 1-inch deep.) Chill until solid, about 3 hours or overnight.

Step 2

Once solid, cut each of the different flavors into small square cubes.

Step 3

Using a 9×13 glass dish, gently mix the cubes together in an even layer (being very careful not to break or tear them.)

Step 4

In a medium-sized bowl, dissolve 2 envelopes of unflavored gelatin in 2 cups of hot water. Let the hot mixture cool slightly and then whisk in the sweetened condensed milk.

Step 5

Let mixture cool to the touch (If it's too warm, it could melt the Jello cubes.) Then evenly pour the mixture over the cubes of Jello.

Step 6

Chill in the refrigerator overnight.

Step 7

Cut into squares and serve.