Turn structure
At the start of your turn, draw 1 card, then play cards from your hand.
The active player must first draw 1 card from the tapeworm deck. After drawing, the player may play one or more cards from their hand that match the color of an open tapeworm segment on the table. Drawing is mandatory; playing is only skipped if there is no legal play available.
Restriction
You may only play cards of one color per turn — the color of the segment you first play on.
Once a player begins their turn by playing a card onto a particular color of open tapeworm segment, all subsequent cards played that turn must be of that same color. You cannot switch to a different color tapeworm mid-turn. The turn ends when: (a) a tapeworm head is played, completing that tapeworm; (b) a played card changes the open-end color of the tapeworm (e.g., a curve card that transitions to a new color); or (c) the player has no more cards of that color to play.
Tile placement
Cards must be placed side by side with a previously played card; all touching segments must match color.
Each card must be placed directly adjacent (side by side) to at least one previously played card. Cards may not overlap. Every segment on the newly played card must match the color of the segments on any adjacent cards it touches. You cannot place a card such that it would hang off the edge of the table. You cannot place open ends of cards against other cards unless they connect correctly — all touching edges must be valid color matches.
Turn structure
Playing a tapeworm head card closes that tapeworm and ends the active player's turn.
When a player plays a head card onto an open tapeworm segment, that tapeworm is completed (closed). The head acts as a terminal piece — no more cards can be added to that end. Playing a head card immediately ends the active player's turn, regardless of whether they have more cards of that color in hand.
Turn structure
If a player has no legal play after drawing, their turn is skipped.
After drawing a card, if the active player has no card in hand that matches any open tapeworm segment on the table — either because no matching color exists or because all open tapeworm ends have head cards on them and the player has no cut card — the player simply skips the rest of their turn and play passes clockwise. The drawn card remains in the player's hand.
Card play
A rainbow (wild) card can be played on any open segment, then permanently takes on that segment's color.
A rainbow card may be played on any open tapeworm segment regardless of color, acting as a universal wild. However, once placed, the rainbow card permanently assumes the color of the first card it is attached to and does not change color afterward. It is then treated as a card of that color for all future placement and matching purposes.
Special
Discard a cut card to sever a tapeworm, removing all cards on the far side of the cut from the start card.
To use a cut card, discard it to sever a tapeworm at the connection point between 2 cards. The cut must be made along a line that connects 2 segments of the same color as the cut card. All cards attached to the cut line on the side furthest from (and moving away from) the start card are discarded. The cut line may not be part of a ringworm — only a segment that, when severed, can be completely detached with a single cut is eligible. A cut card may be played at the beginning of or in the middle of your turn, but the cut card and all other cards played that turn must be the same color.
Special
Peek: Draw a card from the deck, then put a card from your hand on top of the deck.
When a card with the Peek effect is played, the active player draws 1 card from the top of the deck, then places 1 card from their hand on top of the deck. The player may choose to put the card they just drew back on top of the deck (essentially keeping their hand as-is while cycling one card back).