It’s the underlying physics engine that makes Poly Bridge work so well, modeling every bit of stress on each beam of the structure. If the only weight the bridge has to carry is a small scooter you can get away with a few attachments, but a VW van is going to take a little more structural voodoo to support. Want to raise or lower an entire section of bridge? Pistons are your expensive best friends, although you’ll need to pay attention to structural integrity as sections that rely on each other disattach and reattach, changing the load on different sections of the bridge as it moves. Then Poly Bridge introduces the pneumatic piston, which initially seems to be there just to make drawbridges for passing boats but quickly becomes a primary factor in making more elaborate creations.
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Figuring out how to not only support that weight but do it cheap takes experimentation and an eye for stress management, as you figure out if a heavy steel beam may be needed or if you can just run cable to the necessary section. A precision curve tuned to the landing of the car helps, but there’s still a lot of downward force to account for even with a smaller car. When you don’t have enough road to cross the river then it’s time to jump, but the problem with jumps is not only sticking the landing, which will frequently take several times to get right, but compensating for the weight of a car crashing onto the down. Symmetry only lasts so long, though, once Poly Bridge starts pulling out the more clever challenges.
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You don’t have to stretch a component to its full length, of course, but when lining up 3/4-length beams equally on either side of an arch it’s always good to have a precision tool on your side. Each type of material can only stretch so far, and having a grid to line things up against means you can eyeball precise measurements more easily.
Personally I found the grid small enough to allow plenty of free-form creativity while also letting parts line up with perfect symmetry, which may not be all that important for completing the level but certainly goes a long way towards making the resultant creation look pretty. Initially everything is locked to a grid, but after a few puzzles you can choose to turn that off if you want to go with full analog placement. Lay down the road, reinforce it with cheap wooden beams, call out the heavy-duty iron girders when real muscle is needed, etc. Like any construction game worth its girders, Poly Bridge starts off with a few simple ideas. Bridge builder games are fairly common, but Poly Bridge sets itself apart with a cute low-poly style and playful set of puzzles. You start with a few pieces and a budget, fit everything together as best you can, and hope the final structure can pass its test, or at least not collapse into the drink until after the final vehicle has crossed over. Therefore bridges are elite wizard-caliber magic, which is why building them makes for such good puzzle gaming. Engineering is structural magic and bridges are amazing feats of engineering.
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