diff --git a/.Rbuildignore b/.Rbuildignore
index e088807..bab6a08 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -1,3 +1,5 @@
+^renv$
+^renv\.lock$
 ^LICENSE\.md$
 ^\.lintr
 ^docs/
@@ -8,4 +10,4 @@
 ^docs$
 ^pkgdown$
 ^\.github$
-^_HEXAGON_DESIGN_CONTEST\.md$
\ No newline at end of file
+^_HEXAGON_DESIGN_CONTEST\.md$
diff --git a/R/BlockConditions.R b/R/BlockConditions.R
index 0acc047..0a0d0f9 100644
--- a/R/BlockConditions.R
+++ b/R/BlockConditions.R
@@ -14,7 +14,7 @@ setClass("BlockConditions", slots = list(conditions = "list"))
 #'
 #' @param object A `BlockConditions` object.
 #' @param variable A character string specifying the variable/column name.
-#' @param operator A character string specifying the operator (e.g., "==", "!=", "<", ">", "<=", ">=").
+#' @param operator A character string specifying the operator (e.g., "==", "!=", "<", ">", "<=", ">=", "%in%", "!%in%").
 #' @param value The value to compare against.
 #'
 #' @return An updated `BlockConditions` object with the new condition added.
@@ -46,10 +46,17 @@ setMethod("get_str_expression", "BlockConditions", function(object, dataname, da
     var <- cond$variable
     val <- if (is.numeric(data()[[dataname]][[cond$variable]])) {
       cond$value
+    } else if (isTRUE(cond$operator == "%in%" || cond$operator == "!%in%")) {
+      quoted_vals <- paste0(sprintf("'%s'", cond$value), collapse = ", ")
+      sprintf("c(%s)", quoted_vals)
     } else {
-      paste0("'", cond$value, "'")
+      sprintf("'%s'", cond$value)
+    }
+    if (cond$operator == "!%in%") {
+      sprintf("!(%s %%in%% %s)", var, val)
+    } else {
+      sprintf("%s %s %s", var, cond$operator, val)
     }
-    paste0(var, " ", cond$operator, " ", val)
   })
-  paste0("(", paste(conds, collapse = " & "), ")")
+  sprintf("(%s)", paste(conds, collapse = " & "))
 })
diff --git a/R/or_filtering_transformator.R b/R/or_filtering_transformator.R
index d787428..fb68f5b 100644
--- a/R/or_filtering_transformator.R
+++ b/R/or_filtering_transformator.R
@@ -18,7 +18,7 @@
 #'
 #' - **Supported Data Types & Expressions:**
 #'   - Supports filtering on \code{character}, \code{factor}, and \code{numeric} columns.
-#'   - Conditions can use operators: \code{==}, \code{!=}, \code{<}, \code{>}, \code{<=}, \code{>=}.
+#'   - Conditions can use operators: \code{==}, \code{!=}, \code{<}, \code{>}, \code{<=}, \code{>=}, \code{%in%}, \code{!%in%}.
 #'   - Conditions are specified as simple expressions, e.g.,
 #'     \code{columnA == 'value'}
 #'     \code{columnB != 5}
@@ -198,9 +198,8 @@ or_filtering_transformator <- function(dataname) {
                   "Select Condition",
                   choices = c("==", "!=", "<", ">")
                 ),
-                shiny::selectInput(
-                  session$ns(paste0("value_input_", view_model$alt_id())), "Select Value",
-                  choices = NULL
+                shiny::uiOutput(
+                  session$ns(paste0("value_input_", view_model$alt_id()))
                 ),
                 shiny::actionButton(
                   session$ns(paste0("add_condition_", view_model$alt_id())),
@@ -220,7 +219,17 @@ or_filtering_transformator <- function(dataname) {
             operator <- input[[paste0("operator_selector_", view_model$alt_id())]]
             value <- input[[paste0("value_input_", view_model$alt_id())]]
 
-            cond_str <- paste0(variable, " ", operator, " ", value)
+            cond_str <- switch(operator,
+              "%in%" = {
+                quoted_vals <- paste0(sprintf("'%s'", value), collapse = ", ")
+                sprintf("%s %%in%% c(%s)", variable, quoted_vals)
+              },
+              "!%in%" = {
+                quoted_vals <- paste0(sprintf("'%s'", value), collapse = ", ")
+                sprintf("!%s %%in%% c(%s)", variable, quoted_vals)
+              },
+              sprintf("%s %s %s", variable, operator, value)
+            )
 
             # Check for duplicates in current block
             existing_conds <- if (is.null(view_model$block_conditions[[as.character(view_model$alt_id())]])) {
@@ -311,17 +320,46 @@ or_filtering_transformator <- function(dataname) {
             col_data <- data()[[dataname]][[selected_col]]
 
             if (is.numeric(col_data)) {
-              shiny::updateSelectInput(session, paste0("value_input_", current_id), choices = c(unique(col_data)))
+              output[[paste0("value_input_", current_id)]] <- renderUI({
+                shiny::selectInput(
+                  session$ns(paste0("value_input_", current_id)),
+                  "Select Value",
+                  choices = unique(col_data)
+                )
+              })
               shiny::updateSelectInput(
-                session, paste0("operator_selector_", current_id),
-                choices = c("==", "!=", "<=", ">=")
+                session,
+                paste0("operator_selector_", current_id),
+                choices = c("==", "!=", "<=", ">="),
+                selected = "=="
               )
             } else if (is.character(col_data) || is.factor(col_data)) {
+              lvls <- levels(factor(col_data))
+
+              output[[paste0("value_input_", current_id)]] <- renderUI({
+                op <- input[[paste0("operator_selector_", current_id)]]
+                if (!is.null(op) && op %in% c("%in%", "!%in%")) {
+                  shinyWidgets::pickerInput(
+                    session$ns(paste0("value_input_", current_id)),
+                    "Select Values",
+                    choices = lvls,
+                    selected = lvls,
+                    multiple = TRUE
+                  )
+                } else {
+                  shiny::selectInput(
+                    session$ns(paste0("value_input_", current_id)),
+                    "Select Value",
+                    choices = lvls
+                  )
+                }
+              })
+
               shiny::updateSelectInput(
-                session, paste0("value_input_", current_id),
-                choices = c(levels(factor(col_data)))
+                session,
+                paste0("operator_selector_", current_id),
+                choices = c("==", "!=", "%in%", "!%in%")
               )
-              shiny::updateSelectInput(session, paste0("operator_selector_", current_id), choices = c("==", "!="))
             } else {
               shiny::updateSelectInput(session, paste0("value_input_", current_id), choices = NULL)
               shiny::updateSelectInput(session, paste0("operator_selector_", current_id), choices = NULL)
@@ -356,7 +394,7 @@ or_filtering_transformator <- function(dataname) {
           within(
             data(),
             {
-              if (filters != "" & filters != "()") {
+              if (filters != "" && filters != "()") {
                 df <- df |> dplyr::filter(!!rlang::parse_expr(filters))
               }
             },
diff --git a/man/add_condition.Rd b/man/add_condition.Rd
index 7063a41..69c5bc3 100644
--- a/man/add_condition.Rd
+++ b/man/add_condition.Rd
@@ -11,7 +11,7 @@ add_condition(object, variable, operator, value)
 
 \item{variable}{A character string specifying the variable/column name.}
 
-\item{operator}{A character string specifying the operator (e.g., "==", "!=", "<", ">", "<=", ">=").}
+\item{operator}{A character string specifying the operator (e.g., "==", "!=", "<", ">", "<=", ">=", "\%in\%", "!\%in\%").}
 
 \item{value}{The value to compare against.}
 }
diff --git a/man/or_filtering_transformator.Rd b/man/or_filtering_transformator.Rd
index 29190b7..a365908 100644
--- a/man/or_filtering_transformator.Rd
+++ b/man/or_filtering_transformator.Rd
@@ -34,7 +34,7 @@ Each module call is independent and manages filters for its specific dataset.
 \item \strong{Supported Data Types & Expressions:}
 \itemize{
 \item Supports filtering on \code{character}, \code{factor}, and \code{numeric} columns.
-\item Conditions can use operators: \code{==}, \code{!=}, \code{<}, \code{>}, \code{<=}, \code{>=}.
+\item Conditions can use operators: \code{==}, \code{!=}, \code{<}, \code{>}, \code{<=}, \code{>=}, \code{\%in\%}, \code{!\%in\%}.
 \item Conditions are specified as simple expressions, e.g.,
 \code{columnA == 'value'}
 \code{columnB != 5}