Prepare the Gelatin: Prepare four different flavours of gelatin separately according to the package instructions.
Chill Until Firm: Pour each flavoured gelatin into separate shallow containers and refrigerate for 3–4 hours or until completely set.
Cut into Cubes: Once firm, cut the coloured gelatin into small cubes.
Prepare the Creamy Mixture: In a bowl, dissolve unflavoured gelatin in warm water. Add sweetened condensed milk and mix well. Allow the mixture to cool.
Combine Ingredients: Gently fold the colourful gelatin cubes into the cooled creamy mixture.
Refrigerate: Pour everything into a glass dish or mould and refrigerate for another 4–6 hours until firm.
Serve: Cut into squares and serve chilled.