Preheat the oven to 350 degrees F.
Pour the crushed pineapple (juice and all) into a small saucepan, and warm it over low heat. Add sugar.
Heat until the sugar is dissolved, and then remove from the heat.
In a casserole or baking dish, layer the pineapple mixture, cracker crumbs, butter and cheese.
Repeat until you have three to four layers. Sprinkle the remaining 1/4 cup cheese on top of the casserole.
Bake uncovered for about 20 to 25 minutes, until bubbly and golden brown.