untitled_no10_seconds.pnguntitled no. 10 (seconds) by Jonathan Semple is this first entry I've seen in Ludum Dare 27 that hides its 10 second timer from you. You get to see the first few seconds, but after that you and the person you are playing with (as it is a multiplayer-only game) must guess at when the 10 seconds is up so you can stab each other. Stab too early and you lose by disqualification. Stab too late, and... well, you lose by being stabbed.