Avoid the falling crates by moving around (using the ARROW KEYS). You can climb or descend to crates/tiles only one height level different. Once in a while, a bonus will appear (black beacon). Bonuses give you more points if you take them early. Care though - once taken, a crate will start falling towards the exact location! Every time you accumulate 5000 points you gain a teleport charge.
As the game goes on, the room will be slowly filled with water. Moving underwater requires air. If you're out of air you die. Regain air by getting out of the water. You can teleport if you have enough charges (using SPACE). The teleport moves you to a random, not flooded, spot in the room. Be careful as it might move you to undesired places...
Use Transparency Mode (X KEY) to make it easy seeing behind crates and spotting bonuses when things get crowded. Take notice though, that low CPU computers might run transparency mode a bit choppy when there are a lot of crates on the screen.
Out of the blue, you are teleported into an empty, enclosed room. As you wonder what the hell is happening, giant crates fall from the ceiling and the room starts filling with water. Can you survive long enough this stochastic event before teleporting out of the onslaught.