A number of really well engineered robots I can think of-
177- really high release point made them really hard to block and I don't think I ever saw them miss
846- Dozens of really cool details went into this machine to make it great at assisting and scoring high goals.
2485- The phenomenal scoring capabilities as well as the other details- like great human loading make this machine another personal favorite of mine.
A couple really cool robots I know of:
1126- Sparx's cannon was a sight to behold and pretty scary on the field. It also helps that we won a regional with them
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900- I was extremely skeptical at first, but these guys proved to the world that their crazy design could compete at the highest levels. With better luck these guys easily could have been on Einstein for their first year at the World Championship.
27- Their design seems really simple- and it is. But the way their collector works is extremely effective at getting assists by passing on the field or through the human player.
4048- A simple and effective trusser with a goalie stick. There's a reason they won Battlecry. All they needed all year was a top-tier finisher to bring them to the top.
330- A two-sided collector and a weird shooting mechanism would normally make this a slightly above-average robot. An incredible drive team who knows how to make their machine effective makes the Beach Bots so good this year. And a goalie stick to boot.