SuckUK is selling Post-It notes in Tetris formation. Because both Post-It and Tetris are trademarked, they are, instead, called Block Sticky Notes. Semantics. I’m a big proponent of writing on little pieces of paper that stick to things. You know when you hit that point where your To Do List has a bullet point for “Organize My To Do List”? Block Sticky Notes give you that added level of spatial organization. Pick these up if you need an additional thing to get even more OCD about for £7.50 here.