Dissolve two jelly powders (any flavors you like) and take to the fridge until hardened. Cut them into cubes and put them in a glass dish, mix them. Keep in the fridge.
Dissolve the last packet of jelly and transfer to a blender, add the table cream and the condensed milk, blend it all together very well.
Transfer the mixture from the blender to the glass dish.
Let it chill in the fridge for 4 hours.