SizeUp is a fast‑paced, laugh‑filled card game that puts your sense of proportion to the test while gathering a group for a good time. Each round kicks off with the player sporting the biggest grin drawing a challenge card. That card decides whether measurements are in centimeters or millimeters and names the body part or object to be measured – you can’t pick yourself, so get ready to guess a friend’s eyebrow or the width of a train ticket. All players secretly write down their estimate using the numbered cards in their hand; you may play a single card or combine two, adding their values together. Once everyone reveals, the round’s leader uses the included tape measure to check the actual size. The closest guess snags the challenge card. The first to collect five challenge cards wins. Played cards go to a discard pile, and each player refills their hand back to ten cards, ensuring a steady supply of number combos. When the draw pile empties, just shuffle the discard pile and keep going. A single game runs 15‑30 minutes, supports 2‑10 players, and carries a light weight (1/5), making it approachable for all ages. Besides the competitive mode, there’s a cooperative variant where everyone works together to hit the measurements, perfect for players who prefer teamwork over rivalry. Components include challenge cards, numbered cards, and a tape measure, all neatly packed in a compact box. In short, SizeUp blends deduction, humor, and real‑world measuring into unexpected moments and plenty of laughs, making it an ideal ice‑breaker at parties or family gatherings.