Paper Reactions

ONE HAND OF MATERIALS, ONE CHAIN OF REACTIONS
Paper Reactions is a roguelike deckbuilder built on real chemistry. Every card is a substance: hydrogen, iron, hydrochloric acid, copper sulfate solution... Put them in the reaction area, pick the right conditions (ignite, heat, catalyst, electrolysis) and make something new. Then feed the products into the next step. One hand, one chain of reactions.
HOW IT PLAYS 
Build reaction chains: several steps per hand. Products return to your materials to react again or to score. • Make phase combos: submit 1–5 final cards; solids, liquids and gases form scoring combinations. • Grow talismans: combustion, displacement, neutralization, relays... talismans grow with your play style and stack multipliers. • Build your lab: after each stage, buy packs, research and card enhancements in the shop. • Face the round finale: the last stage of each round adds a twist, such as no bonus for metals, gases scoring zero, or only two submissions.

24 STAGES, ONE EXAM
The standard challenge is 8 rounds, 24 stages. At the end, your run is marked like an exam paper: red-pen underlines, a circled score, and a stamped grade. Clear all 24 for an A; double the final target for an A+. Fall short, and you are graded B+ to D by how far you got.
AFTER THE EXAM: ENDLESS
Clear the standard run and keep going. Endless mode awards bronze, silver, gold and diamond medals, and each difficulty has its own Steam leaderboard, ranked by stages cleared, with ties going to the faster time. See a great run? Copy its seed and play it yourself. FEATURES • 360+ real, balanced chemical reactions and 130+ substances • 50+ talismans and four themed starting decks, chosen by seed • Nine round-finale rules that rotate from run to run • Three condition difficulties, from "conditions hinted" to "full condition list, phases hidden" • Hand-drawn paper style with ink-line reaction effects • Three manual save slots plus autosave; tutorial available any time • Controller support • Simplified Chinese and English; single-player, fully offline
FOR CHEMISTRY FANS, AND FOR EVERYONE ELSE
No chemistry background needed: Easy difficulty hints the conditions, and the compendium is always one click away. If you do know chemistry, every equation is balanced the way a school textbook writes it.