An ingenious Spanish thriller about maths, sex, ambition and dog poo.

| Original Score: 3/5 | Jun 2, 2009

The diabolical m.o. in these things is never really satisfactory, and even the fun of the conceit is somewhat muffled by the film's lurid colour design and headachey close-ups.

| Original Score: 2/5 | May 29, 2009

Maths boffins + twist of mystery - patchy ending = uneven thriller.

| Original Score: 3/5 | May 29, 2009

The maths element of the film, which on the surface is its USP, feels like dressing on a taut but tawdry genre thriller.

| Original Score: 2/6 | May 29, 2009

God knows I'm no maths genius but even I can spot that if all four hydraulic presses are pushing the walls inwards at once they would simply jam.

| Original Score: 2/5 | May 29, 2009

The high tension that should come with a race-against-time scenario is never realised, and the film's solution to the enigma of who-what-and-why this all happened is disappointing.

| Original Score: 2/5 | May 29, 2009

It's all done with style, with very little of the strain you might expect from filming in such a restricted environment.

| Original Score: 3/5 | May 29, 2009

A confidently shot, fast-paced first feature.

Full Review | Original Score: 4/5 | May 29, 2009

An ingenious Spanish thriller.

| Original Score: 3/5 | May 29, 2009

There's something dreadfully pedantic about this locked-room mystery.

| Original Score: 2/5 | May 29, 2009