Infinite Stairs: Step Up

From BoardGameGeek:

Add numbers together and climb the Infinite Stairs! Distribute the Stair cards and Coin tokens as instructed, then place the remaining cards in the center of the table. Choose 2 Stage cards according to the desired difficulty and set them for play. The starting player selects one of their cards, places it face up, and announces the number on it. The next player places one of their cards and adds its number to the previous total, announcing the new sum aloud. When a player lands exactly on a checkpoint, they gain a Coin. Use special abilities to earn even more Coins. If a player lands exactly on the final checkpoint of the Stage card, or if they go past it, the Stage immediately ends. After the second Stage ends, the game is over. The player with the most Coins wins.