His score in CC1, currently at 5,977,520, has been embroiled in a struggle for 1st place over the last few years. Andrew Bennett has tied him once, but John Lewis, with Andrew's assistance on Blobnet play, gained 2 seconds over David. Then in 2012 after gaining four extra seconds in Lemmings, Spooks, and Amsterdam, he reclaimed the top position. John Lewis gained 1 second over David. Then David gained 5 seconds on Cake Walk to reclaim the top position.
In CCLP2, David's first-place score of 6,050,910 holds +2 against anyone else on Checkerboard I and Jungle, +1 on Killer Rooms and Escape from Chipkatraz, +9 on Checkerboard II and +8 on Cloner's Maze, lacking -1 on Mads' Rush II and Captured and -2 on Keep Trying.
- Discovery of several glitches, such as the Teleport Skip Glitch, Tank Top Glitch and Frankenstein Glitch.
- Many new records, even from levels that seem to be almost impossible to improve on. A score report from David has become a heralded event in the CC community, as there are very few scores he has not yet reached.
- The adaptation of the Ice block from CC2 into a patch, called pgchip.
- The explanation of Slide Delay, read at that page.
- An automatic score board to automatically keep track of scores on custom level sets.
- Six level sets: pi.dat, pi^2.dat, pi-rejects, computer, minusone, and minustwo.
- Much of the advanced coding in Chip's Challenge. The first introduction to such anomalies is the most insane level ever! from pi.dat, and is still regarded as the definitive insane level.
- He was a staff member for CCLP3, for which nine of his levels were voted: Road Block, Possible, Triple Maze, Mice Are Good for Something, Investment, Color Wheel, Waterslide, and the notoriously more difficult Same Game and Avalanche.
- Befitting his nickname, every level contains the number pi somewhere: drawn in the level, the required sequence of steps to complete it (as in lesson 3.141592653589793238 and organized chaos), or drawn but hidden (as with hidden walls or gravel on the lower layer).
- Usually, to complete a level, specific and exact movements are required in specific directions (including the digits of pi, as described earlier) and in a specific order, even if this is not apparent or simply illogical.
- Some of the more famous levels utilize advanced coding (including the most insane level ever!), glitches in Chip's Challenge which are often exclusive to one version of the game only, weird anomalies, and other crazily hard challenges. One specific level, the ending cut from pi.dat, contains 13 rooms of fireballs which have varying amounts of ice in them to cause the red buttons to be hit at different times, creating a very long cloning polyrhythm. This sequence will produce fruit only when all 13 glider and fireball clone machines in the southeast area activate in a rhythm where each succeeding monster knocks the next safely east in a domino pattern until the last glider detonates one bomb. On the 53rd occurrence of this cycle, the button in the corner will remove the bomb at the start, allowing Chip to exit. The total time required to beat this level, appropriately named the end of all time, is more than 314 septillion years (another pi nugget).