Mirror's Edge's inability to find a soul beneath all the action may be a shortcoming, but its biggest difficulty is a matter of balance. It's no coincidence that the game continues to shine once the curtain has fallen. Post-story challenges like time trials give players free reign to explore rooftops, develop strategies, then run like hell to beat the clock. Here the motivation is totally artificial. Players aim to beat a time and put their name on a leader board. When immersed in plot, motivation, though foggy, is to avoid bullets and stay alive. To merge such motivation with urgency and a palpable sense of danger is a delicate dance -- one Mirror's Edge hasn't quite mastered.