A portal is an object through which the first blockhead warped into a world enters. Each world starts with one portal. Additional portals can be crafted at a workbench. The portal can subsequently be used to craft items, make in-app purchases, and warp in up to four additional blockheads for a total of five in a single-player world.
Portal upgrades require a gem of the correct type and a number of time crystals dependent on the upgrade. The progression of upgrades parallels the rarity of the gems used. Portal upgrades require resources which are consumed if the requirements are met. Those upgrades unlock items that can be warped in.
Products
With the proper resources, a portal can be used to "warp in" a variety of items.
Note: A portal will not allow trading multiple coins of a larger denomination for 100 coins of a smaller denomination. Each coin must be traded individually.
Warping in resources was removed in version 1.4 because the developer, David Frampton, felt that the warping in of resources "felt too much like cheating".
A level 2 workbench can be used to create additional portals for one stone and 120 time crystals. These portals are level 1 and placed directly into a blockhead's inventory. They can then be placed much as any other crafting surface except that they are three blocks tall. This is because they have both a portal's two-high "loop" and a single stone block as a base.
Unlike a world's default portal, the block an added portal stands on is patterned as placed stone, not smooth, natural stone. They also offer the option of being picked up and relocated by a blockhead similarly to any other Crafting Surface. Like the original portal, it can be upgraded and produce any of the appropriate products.
Trivia
Creator David Frampton said in an August 22, 2016, Twitter post, "Random Blockheads trivia: The whole portal thing was inspired by Stargate. I was watching SG-1 at the time."