I've been sitting at my desk for half an hour trying to guide a tiny spaceship between two lines of a graph in a computer game disguised to make it appear as though I'm hard at work. If anyone walks over I press the spacebar and it disappears. Despite the fact I've not had cause to create a graph since my schooldays, nobody seems in the least suspicious. This is too easy.

As it is, I'm doing my utmost to draw attention to myself. I start sighing and banging my fists on the desk each time I lose a life, but everyone has their headphones on and is oblivious to my crime.

In the end, I show the graph to my colleague and tell her it's the results of a survey about office productivity, while I merrily steer my ship through the middle of it. It's a good couple of minutes before she notices that something is up. "Is that a spaceship?" she tentatively asks. Finally, I've been caught!

This is the latest internet timewasting scam as showcased by Can't You See I'm Busy!, a website that allows bored office workers to play simple flash games without getting caught. With backdrops closely resembling typical office applications such as spreadsheets and Word documents, the site proudly estimates it has already cost the economy more than £4m in reduced productivity.

Should you grow tired of spaceships, two further games are provided to fool your boss with. Breakdown clearly takes inspiration from the Atari classic Breakout, except with the text of a work document to destroy instead of blocks. A further game, CostCutter, is a Tetris-like puzzle that involves removing cubes of the same colour before they reach the end of the screen under the guise of a simple bar chart.

To be honest though, I'm finding them a little dull. In fact, I'd probably rather be working. The games are pretty retro and only really interesting for the first five minutes; not long enough for a proper skiving session. Let's face it, I can spend longer than that making a cup of tea.

It's not just online games that have cottoned on to the benefits of providing a safe outlet for slackers. Spreadtweet allows you to watch your Twitter feed all day while looking like you're working on a spreadsheet. Totesport, an online betting website, provides a little exclamation mark at the top of the screen which, when clicked, quickly redirects you to a nondescript "sales spreadsheet". The football365.com forum too has a "Quick, Boss!" button just in case you get caught off guard.

It seems it is easier than ever to get away with doing things you shouldn't be doing in the office. All we need now is Facebook to jump on the bandwagon and nobody in the UK will be doing any work whatsoever. What are your secret timewasting favourites?